bg3 act-3 boss steel-watch titan foundry honour-mode

Steel Watch Titan

Act 3 Updated 2026.05.11

Giant construct boss in the Steel Watch Foundry Control Centre. Massive HP, AoE laser, self-destruct. Disable the foundry power core first to weaken it. Vulnerable to Lightning.

Steel Watch Titan — Foundry Control Centre

Location: Steel Watch Foundry Control Centre, Lower City. Final room of the Foundry after fighting through the production floor.


Pre-Fight Checklist

  1. Disable the Foundry power core first (separate side room). This weakens ALL Steel Watchers in the city, including the Titan. Without this, the Titan is significantly harder.
  2. Ironhand Gnomes help if you rescued them from Grymforge. They disable traps and provide a Runepowder Bomb.
  3. Long rest before entering the Foundry.
  4. Heroes’ Feast + Aid — Titan hits hard.
  5. Bring Lightning damage — Constructs are Vulnerable to Lightning.
  6. Bring multi-hit attacks — Construct has Unstoppable in Honour Mode.

Boss Mechanics

MechanicDetail
TitanHuge construct, ~400 HP (less if core disabled). Immune to crit, poison, bleed, fear, charm, prone. Resistant to non-magical B/P/S. Vulnerable to Lightning (double damage).
AoE LaserLine AoE dealing massive Fire + Radiant damage. Telegraphed (red line on ground). MOVE.
Self-Destruct ProtocolAt ~25% HP, the Titan starts charging a self-destruct. 2-turn countdown, then massive AoE explosion. Kill it before the timer expires or RUN.
Unstoppable (Honour Mode)The Titan has Unstoppable stacks (reduces all damage). Multi-hit attacks strip stacks. Magic Missile perfect here.
Adds2-4 Steel Watcher adds join during the fight. Focus them or ignore and burn Titan.
Hellfire Engine CrossbowOne add drops this Very Rare +2 heavy crossbow.

Strategy

Tactics

TacticDetail
Wet + Lightning = winConstructs are Vulnerable to Lightning (double damage). Wet them (Create Water) for ANOTHER doubling = 4× damage. Storm Sorc’s Twin Chain Lightning on a wet Titan can hit for 200+ damage.
Strip UnstoppableMagic Missile (3+ darts), Scorching Ray, or multiple weapon attacks. One stack removed per hit. Once stacks are gone, unload burst damage.
Dodge the laserRed line → move. It’s a one-shot in Honour Mode if you stand in it.
Runepowder Bomb (Ironhand Gnomes)Place it near the Titan and detonate. Deals massive Force damage. The Runepowder Bomb is a one-time item from the Ironhand Gnomes. Use it here.

Party Assignment

BuildRole
Storm Sorc⭐ Create Water → Twin Chain Lightning. Construct + Wet = 4× damage. Also Magic Missile to strip Unstoppable.
Wild Magic SorcMagic Missile to strip stacks. Disintegrate once stacks are gone. Fireball the Watcher adds.
ShadowheartBless on Storm Sorc + Lae’zel. Sanctuary on the Runepowder bomb carrier.
BardadinSlashing Flourish + Divine Smite. Radiant damage works fine.
Lae’zelAction Surge → 6 GWM attacks. Each hit strips one Unstoppable stack.
ThrowzerkerEnraged Throw (auto-prone… wait, constructs can’t be proned). Just throw Returning Pike/Nyrulna for damage.
AstarionSharpshooter. Arrow of Construct Slaying. Deadeye shot.

Honour Mode Specifics

  • Self-destruct timer is shorter in Honour Mode. If you can’t kill the Titan before the timer expires, move EVERYONE to the edges of the room. The explosion covers the entire center.
  • Laser one-shots anyone in Honour Mode. Don’t get greedy with positioning.
  • Adds are stronger — focus the Titan and ignore adds if you can kill it fast. If the add count reaches 4+, clear some.
  • Lightning Resistance on the Titan in Honour Mode (dependent on core status). If you didn’t disable the core, it’s resistant to Lightning too, not vulnerable. DISABLE THE CORE.

Post-Fight

  • Loot the Titan: Gontr Mael (legendary longbow, Guiding Bolt on hit, Celestial Haste without lethargy).
  • Loot the area: Hellfire Engine Crossbow (very rare +2 heavy crossbow).
  • The Steel Watch is destroyed city-wide. Gondians freed. Ironhand Gnomes rewarded.