Act 4 Complete Walkthrough — Every Zone, Secret...

Act 4 Overview

Act 4 is Arms of God's current endgame content. It contains 7 main zones, 4 optional zones, 3 mini-bosses, and the final boss Divine Engine Omega. The recommended level is 16+, and you should have at least an A-tier weapon merge before entering.

Zone Order (Optimal Path)

1. Abandoned Cathedral (Entrance Level)

Enemies: Corrupted Priests, Shadow Wisps

Difficulty: Easy

Key Loot: Cathedral Upgrade Token x1

Tips: The priests explode on death. Don't cluster them.

2. Hall of Judgment (Main Path)

Enemies: Inquisitor Knights, Judgment Orbs

Difficulty: Medium

Key Loot: +2 Weapon Upgrade Stone

Tip: The Judgment Orbs heal nearby enemies. Prioritize them.

3. Sanctum of Trials (Optional)

Enemies: Trial Guardians

Difficulty: Hard

Key Loot: Legendary Blessing Choice

Reward: Choose one of three legendary blessings. Recommended: Phoenix Blessing (revive once per act).

4. Lower Archives

Enemies: Ancient Archivists, Tome Guardians

Difficulty: Medium

Key Loot: Skill Point Tome (+1 passive point)

Secret: The Archivists sometimes drop Archive Keys. Collect 3 for a hidden room.

5. Forge of Souls (Optional)

Enemies: Soulforged Constructs

Difficulty: Hard

Key Loot: Cathedral Upgrade Token x2

Secret: Constructs drop Soul Fragments. 5 fragments = free weapon merge at the forge.

6. Grand Library

Enemies: Enchanted Bookshelves, Lore Guardians

Difficulty: Easy-Medium

Key Loot: +3 Weapon Upgrade Stone

Tip: The bookshelves shoot magic missiles. Break them first.

7. Ossuary (Mini-Boss)

Boss: The Lich King

Difficulty: Medium-Hard

Rewards: +4 Weapon Upgrade Stone. Lich King's Phylactery (quest item for hidden Cathedral blessing).

Strategy: Lich King summons skeletons. Use AoE. Don't let him complete the resurrection channel.

8. Heavenly Corridor

Enemies: Seraphim Warriors, Holy Archers

Difficulty: Hard

Tip: Seraphim have high physical resistance. Use elemental damage.

9. Garden of Echoes (Optional)

Enemies: Echoes of Past Heroes

Difficulty: Variable (matches your level)

Reward: Stat boost of your choice (HP, Damage, or Speed)

Tip: Each Echo has a different build. Adapt your strategy.

10. Throne Room (Boss Arena)

Boss: Divine Engine Omega

Difficulty: Very Hard

See our Divine Engine Omega guide for full strategy.

Cathedral Upgrades in Act 4

You can upgrade the Cathedral at the start of Act 4 and after each boss kill. Prioritize:

1. Divine Armor (first) — 500 gold, +10% max HP

2. Holy Strike — 400 gold, +8% damage

3. Ancient Knowledge — 600 gold, +1 passive point

4. Sacred Barrier — 800 gold, +15% elemental resistance