Chapter 4 Walkthrough — The Demon Gates

Complete Chapter 4 walkthrough for Crimson Desert. The climactic chapter featuring Gabriel Caliburn, faction warfare, two Gatekeeper boss fights with elemental rotation, the 30-minute Battle of the Demon Gates setpiece, and 8 dialogue decisions that determine Chapter 5.

Overview

Chapter 4 is the climax of the first half of Crimson Desert. The Demon Gates have opened, faction warfare erupts across Pywel, and Kliff must unite — or divide — the surviving factions to face the Abyss threat. Chapter 4 is the longest chapter, running 10–14 hours of main story plus 15+ hours of side content. It features 3 major boss fights (Mordeth, Valtrix, plus the 5-phase Battle of the Demon Gates setpiece), 2 faction alliance decisions, and the climactic choice that determines whether Chapter 5 is a victory lap or a desperate final stand.

By the end of Chapter 4 you should be Level 38–46, fully kitted in Tier 4 gear with at least one Tier 5 legendary, your Black Bears crew at full 10-member strength, and 3 of the 4 factions allied with you. The chapter culminates in the Battle of the Demon Gates — a 30-minute setpiece that uses your accumulated faction reputation, companion loyalty, and gear to determine the result. Chapter 4 has the most missable quests of any chapter (6 of 22 side quests are missable).

Recommended pre-chapter setup: bring 30 healing potions, 20 mana potions, 15 stamina tonics, a Tier 4 main weapon with elemental mod, full Tier 3+ armor set, and at least 5 companion-bond items. This is the chapter where preparation matters most — the Battle of the Demon Gates cannot be brute-forced without proper setup. Save before every major choice and before the Battle. Plan to complete the 6 MISSABLE quests (especially quest 2 The Assassin's Trail) before triggering the Grehen War Escalation event in 4.6.

Chapter Walkthrough

4.1 — The Summons: Chapter 4 opens with a summons from House Celeste. Travel to the Hernand capital where the Great Council is convening. Recommended Level 38+. Multiple dialogue nodes here set up the rest of the chapter.

4.2 — Gabriel Caliburn's Return: The legendary general Gabriel Caliburn returns from exile. He proposes a unified assault on the Demon Gates. You can support or oppose him — see Choice A in the Dialogue section below. Recommended Level 39+.

4.3 — The Faction Negotiations: Travel to each faction's stronghold to negotiate alliances. There are 4 factions: House Celeste, The Sand Wardens, The Crimson Cabal, and The Pilgrims. You need at least 3 of 4 allied for the Battle to succeed.

4.4 — The Assassination Attempt: A major event. Caliburn is nearly assassinated; you must investigate. The investigation branches depending on your faction allegiances — see side quests below. Recommended Level 40+.

4.5 — The Battle of Hernand Plains: A 3-wave defense battle that teaches the battle command system. Successfully defending unlocks the 'Tactician' achievement and grants +200 reputation with all allied factions.

4.6 — The Crimson Cabal's Betrayal: If the Cabal is allied with you, they betray at this point. You must choose: forgive them (keep alliance but lose reputation), disband them (lose Cabal access permanently), or execute the leaders (gain reputation but lose Cabal quest rewards). After this trigger, 6 MISSABLE quests expire.

4.7 — The Witch's Return: Myurdin (if alive from Chapter 3) returns with a warning. She offers her magic knowledge in exchange for your help against the Abyss. Accepting unlocks unique Chapter 5 dialogue.

4.8 — The Demon Gate Expedition: Travel to the Demon Gates. This is a 3-hour dungeon crawl with 5 mini-bosses and 2 secrets. Recommended Level 42+.

4.9 — The First Gatekeeper: First Demon Gate boss. See boss strategy below. Recommended Level 44+ with Tier 4 weapons.

4.10 — The Second Gatekeeper: Second Demon Gate boss. See boss strategy below. Recommended Level 44+.

4.11 — The Choice of Unity: The climactic multichoice moment — see Choice H in the Dialogue section below. This determines Chapter 5's tone.

4.12 — The Battle of the Demon Gates: The 30-minute setpiece. Success requires proper preparation. See strategy section below.

4.13 — The Abyss Beckons: The chapter finale, setting up the Chapter 5 descent into the Abyss.

Boss Strategy — First Gatekeeper Mordeth the Hoarder & Second Gatekeeper Valtrix the Spellweaver

Chapter 4 features two Gatekeeper bosses back-to-back. Each has a 3-phase fight designed to test every system you've mastered. Both share the v2 signature mechanic: rotating elemental vulnerability. Like Trukan, both Gatekeepers shift weakness each phase, rewarding weapon enchantment switching.

Mordeth the Hoarder — Phase 1 (100%–60% HP): Mordeth uses wide cleaving attacks with all 4 arms. Counter by staying behind him and attacking his legs. Elemental weakness this phase: Fire (Mordeth's hoarded armor is iron — fire melts the joints exposing weak points). He summons 2 adds once at 80% HP — prioritize them.

Mordeth — Phase 2 (60%–30% HP): He summons a shield wall that absorbs frontal damage. Bait him into raising it, then attack from the sides. Elemental weakness this phase: Lightning (the shield wall conducts electricity, shocking him through the metal).

Mordeth — Phase 3 (30%–0% HP): Berserker mode, +50% damage but -30% defense. Burst him down. Elemental weakness this phase: Physical/Bleed (his rage strips his armor's elemental resistance, leaving him vulnerable to physical damage). Loot: Mordeth's Heart (crafting), Demonsteel (rare material), 1200 Gold.

Valtrix the Spellweaver — Phase 1 (100%–60% HP): Valtrix summons 4 lesser demons and casts fireballs. Counter with area-of-effect abilities. Elemental weakness this phase: Ice (Valtrix's fire shields shatter under cold damage, exposing her core).

Valtrix — Phase 2 (60%–30% HP): Valtrix opens a portal that spawns continuously. Destroy the portal in 30 seconds or be overwhelmed. Elemental weakness this phase: Holy (only holy damage can disrupt the portal's magic).

Valtrix — Phase 3 (30%–0% HP): Valtrix fuses with a demon and becomes a melee hybrid. Use counter-magic. Elemental weakness this phase: Lightning (her hybrid form has unstable magical energy that lightning disrupts). Loot: Spellweaver's Eye (legendary crafting), Demonic Tome (unique spell), 1500 Gold.

Hard Mode Tips (Both Gatekeepers): Bring 6 healing potions and 4 mana potions total. The Demonic Tome (Valtrix Phase 3 drop) is the strongest mage off-hand in the game — try to get it before Chapter 5. Switch your weapon's elemental mod between fights (fire → lightning for Mordeth, ice → holy → lightning for Valtrix). The Battle Tactician set (from quest 7) gives you +15% troop command range which is essential for the Battle of the Demon Gates setpiece in 4.12. Have all 4 companions active for the Valtrix fight — the portal phase requires party DPS.

All Side Quests

Chapter 4 has 22 side quests — the most of any chapter. Critical ones are flagged.

1. Gabriel's Sword — Recover Caliburn's legendary sword. Reward: Caliburn's Blade (unique weapon).

2. The Assassin's Trail (MISSABLE) — Triggered only if you supported Caliburn in 4.2. Must be triggered before 4.6. Investigate the assassination attempt. Reward: 1000 Gold + Assassin faction unlock.

3. The Council's Vote — Lobby the Great Council for war declaration. Reward: 500 Gold + Political Power.

4. The Sand Warden Reinforcements — Negotiate Sand Warden military support. Reward: Sand Warden faction +200.

5. The Crimson Cabal's Secret — Discover the Cabal's true plans. Reward: 800 Gold + Cabal intelligence.

6. The Pilgrim's March — Lead a pilgrimage to the Demon Gates. Reward: 600 Gold + Pilgrim faction +300.

7. The Battle Commander — Train troops for the Battle. Reward: 1000 XP + Tactician gear set.

8. The Black Bear's Heritage — Discover the Black Bears' original founding. Reward: 500 Gold + Heritage achievement.

9. The Witch's Bargain — Myurdin's quest (if she is alive). Reward: Magic knowledge + 1500 XP.

10. The Demon Gate Map — Recover a tactical map. Reward: 700 Gold + Battle advantage.

11. The Refugees' Plight — Help refugees displaced by the war. Reward: 600 Gold + Refugee faction +200.

12. The Traitor's Mark (MISSABLE) — Triggered only if you opposed Caliburn. Must be triggered before 4.6. Reward: 1500 Gold + Traitor's Blade.

13. The Ancient Alliance — Discover a 1000-year-old alliance. Reward: 1000 XP + Lore achievement.

14. The Demon Within — Investigate a soldier who may be possessed. Reward: 800 Gold + Demon Hunter's Charm.

15. The Siege Weapons — Build 5 siege weapons for the Battle. Reward: 1000 Gold + Engineer's Tools.

16. The Spy's Confession (MISSABLE) — Interrogate a captured spy. Must be triggered before 4.6. Reward: 700 Gold + Spy Network unlock.

17. The Final Training — Companion quest for all 10 Black Bears. Reward: 2000 XP + Team Bond achievement.

18. The Healer's Vow — Gather medical supplies. Reward: 800 Gold + Healer's Token.

19. The Prisoner's Request — A Cabal prisoner asks for mercy. Reward: 100 XP + Morality achievement.

20. The General's Regret (MISSABLE) — Caliburn's personal quest, only if friendship >50. Must be triggered before 4.11. Reward: 1500 XP + Caliburn's respect.

21. The Demon Gate Keeper's Tome — Find an ancient demon-slaying manual. Reward: Demon Slayer gear set.

22. The Final Preparation (MISSABLE) — Pre-Battle checklist quest. Complete 21 other quests before 4.12 for +25% Battle success bonus.

Hidden Secrets

Chapter 4 has 11 hidden secrets including the most game-changing ones in the entire game so far.

Secret 1 — The Council's Secret Vault: Beneath the Great Council chamber, a vault contains 5000 Gold and a Tier 5 weapon. Combination is the year of Caliburn's first victory.

Secret 2 — Caliburn's True Motivation: During a private conversation (requires 60+ friendship), Caliburn reveals his true motivations. Unlocks the 'Behind the General' achievement.

Secret 3 — The Cabal's True Leader: The Crimson Cabal's leader is not who you think. Discovering this unlocks a major plot branch in Chapter 5.

Secret 4 — The Pilgrim's Hidden Saint: One of the Pilgrims is a saint in disguise. Unlocking this grants a permanent +10% magic resistance.

Secret 5 — The First Gatekeeper's Prisoner: Mordeth is keeping a prisoner. Freeing them unlocks a powerful ally for Chapter 5.

Secret 6 — The Second Gatekeeper's Library: Valtrix's library has forbidden demon spells. Looting them unlocks dark magic for warrior builds.

Secret 7 — The Battle Map's Hidden Weakness: The Demon Gates have a hidden weakness only visible on the alternate map. Exploiting it makes the Battle significantly easier.

Secret 8 — The Witch's True Form: If you accept Myurdin's bargain and complete her quest, you discover her true form — a major Chapter 5 revelation.

Secret 9 — The Black Bears' Founder's Grave: A hidden grave marker in the Hernand plains contains the founder's last words. Unlocks the Black Bears Heritage achievement and a Tier 5 ring.

Secret 10 — The Demon Gate's Hidden Door: A secret door behind the second Gatekeeper leads to a treasure room with the Abyssal Armor set.

Secret 11 — Mordeth's Regret (NEW): Before the final hit on Mordeth (Phase 3 at 10% HP), you can trigger a hidden dialogue option (requires reputation with the Demon faction from completing the Cursed Knight Fontaine quest) where Mordeth begs for mercy. Choosing 'I understand' (instead of killing him) unlocks the 'Pacifist IV' achievement and a unique questline where Mordeth becomes a Chapter 5 ally.

Dialogue Choice Impact

Chapter 4 has 8 major dialogue choices, with the climactic Choice H determining Chapter 5.

Choice A — Support or Oppose Caliburn: Support = Caliburn joins your party as a temporary companion. Oppose = you gain political power but lose Caliburn as an ally.

Choice B — Which 3 of 4 Factions to Ally: You must choose 3. Each faction has unique rewards. House Celeste = political power. Sand Wardens = military strength. Crimson Cabal = magic knowledge. Pilgrims = divine blessings.

Choice C — The Assassination Investigation: The investigation branches. You can accuse the Cabal (start a war), accuse the Pilgrims (alienate them), or discover it was Caliburn himself (major plot twist).

Choice D — The Cabal's Betrayal Response: As described in 4.6. Each option has major consequences.

Choice E — Myurdin's Bargain: Accept = magic knowledge. Refuse = warrior's honor. Affects Chapter 5 dialogue significantly.

Choice F — The Traitor's Mark: If triggered, you must decide whether to expose the traitor publicly (gain reputation but lose an ally) or cover it up (keep the ally but lose reputation).

Choice G — The Healer's Vow: Decide whether the medical supplies go to soldiers or refugees. Both choices have moral weight but no gameplay difference.

Choice H — THE CLIMACTIC CHOICE OF UNITY: THE CHAPTER'S SIGNATURE CHOICE. Four options. (1) Unite All — All factions cooperate (requires all 3 chosen to have +400+ reputation; unlocks best Battle outcome and 'United We Stand' achievement). (2) United Front — 2 main factions + 1 support (unlocks good Battle outcome). (3) Solo Assault — You fight alone with your Black Bears (very hard Battle but unlocks 'Lone Wolf' achievement and unique Chapter 5 path). (4) Surrender to the Demon Gates — Game ends with a 'Conquered' ending (you lose but unlock the secret 'What If' ending in New Game Plus).

Battle of the Demon Gates Strategy

The Battle of the Demon Gates is a 30-minute setpiece with 5 phases. Success depends entirely on your preparation.

Phase 1 — Opening Salvo (5 min): Use siege weapons to weaken the Gate. Each siege weapon you built in side quest 15 deals 10% more damage. Recommended: bring at least 3 siege weapons.

Phase 2 — First Wave (5 min): 100 lesser demons pour through the weakened gate. Your troops must hold the line. Faction reputation determines troop quality — Sand Warden alliance gives +30% troop effectiveness.

Phase 3 — Elite Assault (5 min): 10 elite demons attack. This is where the Tactician gear set from side quest 7 makes a big difference (+15% troop command range).

Phase 4 — Gatekeeper Battle (10 min): Both Gatekeepers emerge simultaneously. You must defeat at least one to proceed. Use the Battle Map's hidden weakness (Secret 7) if you found it — this halves both Gatekeepers' HP.

Phase 5 — The Final Push (5 min): Push into the Gate and seal it. Success requires Kliff to reach the seal point with at least 30% HP remaining. Failure to reach the seal = lose the Battle.

Victory Outcomes: Unite All = complete victory, +1000 XP, 'United We Stand' achievement. United Front = partial victory, +500 XP. Solo Assault = narrow victory, +800 XP. Surrender = lose.

Chapter Endings Unlocked

Chapter 4 has 4 main endings and 8 hidden variants.

Ending 1 — United We Stand: All factions united. Chapter 5 begins as a victory march. Unlocks the 'United' achievement and the best Chapter 5 starting conditions.

Ending 2 — United Front: Two main factions. Chapter 5 begins with some allies. Unlocks the 'United' achievement.

Ending 3 — Lone Wolf: Solo assault success. Chapter 5 begins with just the Black Bears. Unlocks the 'Lone Wolf' achievement and a unique Chapter 5 path.

Ending 4 — The Conquered: Surrender ending. Triggers the 'What If' New Game Plus mode.

Hidden Variant — The Witch's Path: If you completed Myurdin's bargain and discovered her true form (Secret 8), Chapter 5 has an extended magic storyline. Unlocks the 'Archmage' achievement.

Hidden Variant — The General's Path: If you got Caliburn's true motivations and completed his personal quest, Chapter 5 has an extended military storyline. Unlocks the 'Tactician' achievement.

Hidden Variant — The Traitor's Path: If you covered up the traitor in Choice F, Chapter 5 has a betrayal subplot. Unlocks the 'Shadows' achievement.

Hidden Variant — The Hidden Door: If you found Secret 10, Chapter 5 begins with the Abyssal Armor set equipped. Unlocks the 'Abyssal Walker' achievement.

Hidden Variant — The Pacifist IV: If you triggered Secret 11 and chose 'I understand' (instead of killing Mordeth), you unlock a unique Chapter 5 opening where Mordeth becomes an ally. Unlocks the 'Pacifist IV' achievement (rare, <5% of players get this).

Hidden Variant — The True Alliance: If you got all 3 chosen factions to +500 reputation AND completed Secret 4 (Pilgrim's Saint), you unlock a unique Chapter 5 subplot where all factions survive. Unlocks the 'True Alliance' achievement (rare, <3% of players get this).

Plan your Chapter 4 playthrough carefully — your Chapter 5 starting conditions depend heavily on which ending you achieve here.