BG3 Boss Guide: How to Beat Every Major Boss — Beginner Strategies

Act 1 Bosses

Commander Zhalk (Nautiloid Tutorial)

Level: 1 HP: 150 Strategy: Don’t try to kill him. Your goal is to reach the transponder at the front of the helm. However, if you want his Everburn Blade, have Shadowheart cast Command: Drop before activating the transponder. The mind flayer ally tanks Zhalk. Grab the sword and run.

Phase Spider Matriarch (Whispering Depths)

Level: 4 HP: 125 Strategy: The matriarch spawns on web bridges. Burn the webs. When she’s standing on a web bridge, use Fire Bolt or Alchemist’s Fire to destroy it. She falls, takes 30-50 fall damage, and goes prone (Advantage on melee attacks). Repeat. Kill phase spiderlings first — they’re fragile but deal poison damage.

Auntie Ethel (Teahouse / Lair)

Level: 5 HP: 145 (including clones) Strategy: Ethel creates multiple illusory clones. The real one has higher AC and different dialogue. Use Magic Missile — it auto-hits and one missile per clone dispels them. Bring Protection from Evil and Good. In her lair, avoid the cage with Mayrina — push Ethel away from her.

Act 2 Bosses

Yurgir (Gauntlet of Shar)

Level: 7 HP: 145 Strategy: Don’t fight him head-on. Persuade him (DC 21) that his contract has a loophole. He’ll kill his minions + displacer beast + himself. Free XP and loot with zero combat.

Ketheric Thorm (Moonrise Towers → Mind Flayer Colony)

Level: 8-9 HP: 210 (human) + 240 (Myrkul avatar) Strategy: Covered in detail in our Act 2 walkthrough. Key points:

• Phase 1 (rooftop): Burst him down, ignore adds
• Phase 2 (Myrkul): Free Dame Aylin ASAP. Blind the avatar. Stay off bone chill platforms.
• Bring Radiant damage (Spirit Guardians, Divine Smite, Guiding Bolt)

Act 3 Bosses

Orin the Red (Bhaal Temple)

Level: 11-12 HP: 210 Strategy: Orin has Unstoppable (10 stacks, blocks all damage). Remove stacks with multi-hit attacks (Magic Missile, Scorching Ray, Eldritch Blast, Fighter multi-attack). After stacks are gone, burst her. Kill the Bhaal cultists chanting in the corners — they restore her Unstoppable stacks. Protect your kidnapped companion.

Raphael (House of Hope)

Level: 12 HP: 666 Strategy: The hardest fight in the game.

1. Destroy the 4 Soul Pillars first — they make Raphael invulnerable. Use Force damage (Eldritch Blast).
2. Hold Monster on Raphael (he has +0 WIS save). Paralyzed = auto-crit melee hits.
3. Globe of Invulnerability — stand inside, immune to all damage for 3 turns.
4. Hope (ally) has Divine Intervention. Use it for massive radiant damage.
5. Bring smokepowder barrels from the Iron Throne. Stack them around Raphael before the fight starts (dialogue pauses the game).

Netherbrain (Final Boss)

Level: 12 (max) HP: 350 Strategy: This is a timed fight — you have 5 turns before the Netherbrain unleashes its ultimate attack. Platform phase: your entire party climbs/brain hops to the Crown of Karsus. A mind flayer ally (Orpheus, Karlach, or you) channels the Netherstones. Portal phase: enter the Netherbrain’s psyche. Inside, burst it down. Use all your saved scrolls, potions, and one-time abilities. This is the last fight — there’s nothing to save resources for.

Pre-fight preparation:

• Summon ALL allies you’ve gathered (Call Forth Allies action)
• Drink Elixirs of Universal Resistance
• Cast Heroes’ Feast, Longstrider, Death Ward on everyone
• Speed potions for every character (extra action = 3 turns of double actions)
• Disintegrate scrolls deal massive force damage (Netherbrain has no force resistance)