Grym — Adamantine Forge

Location: Grymforge depths. Accessed via the elevator past the duergar camp. Insert a Mithral Ore + Mould into the forge, then pull the lever to summon Grym.

Boss Mechanics

Mechanic	Detail
Grym	Huge construct, ~300 HP. Immune to ALL damage except Bludgeoning. Superheated condition (takes double Bludgeoning) when standing in lava.
Adamantine Golem	Cannot be pushed, pulled, proned, disarmed, frightened, poisoned, or crit. Construct immunities.
Lava	The forge platform has lava grates. Grym steps in lava → Superheated (vulnerable to Bludgeoning). His footsteps also create lava pools.
Forge Hammer	The central platform has a lever. Pulling it drops a massive hammer dealing 100-150 Bludgeoning damage to anything on the center. This is your PRIMARY damage source.
Legendary Action (Honour Mode)	Grym gains Quake — stomp that knocks everyone Prone in a large AoE. Can interrupt your hammer lure strategy.

Strategy — Hammer Method

This is the intended (and safest) method. Don’t try to melee him down — it takes forever and Grym hits extremely hard.

Setup

Before pulling the lever: craft your first Adamantine item (Scale Mail or Shield recommended). The forge needs one Mithral Ore + one Mould.
Position party: One character stands at the hammer lever (elevated platform). Everyone else on the far side of the arena, AWAY from the central platform.
Summon Grym: Pull the forge lever when ready. Grym emerges from the lava pipe.

Lure and Hammer Loop

Bait Grym onto the central platform. He fixates on the last character who hit him. Use the lever character or a ranged attacker to ping him, then stand on the far side of the center ring.
Once Grym steps onto the center (his circle overlaps the central grate), pull the lever. The hammer drops for ~120 Bludgeoning.
Repeat until dead. Takes 3 hammer hits.
Between hammer drops: Grym moves toward whoever hit him last. Rotate aggro — one character on lever, one on bait, everyone else ranged.

Party Assignment

Role	Who
Lever puller	Shadowheart (ranged, can Sanctuary herself). Stands at the lever.
Bait	Throwzerker or Astarion — hit Grym from range, then run to opposite side of center.
Ranged damage	Storm Sorc (Magic Missile — Force works, but Bludgeoning is best), Wild Magic Sorc.
Emergency melee	Lae’zel or Bardadin — only if Grym gets stuck off-platform. Use bludgeoning weapons (mauls, warhammers).

Alternative — Bludgeoning Melee

If you insist on fighting Grym directly:

Equip EVERYONE with bludgeoning weapons (mauls, warhammers, maces, quarterstaves).
Keep Grym standing in lava (Superheated = double Bludgeoning damage).
Use Haste/Potion of Speed and unload. At level 5-6, each melee hit deals ~20-30 Bludgeoning (Superheated).
⚠️ Grym hits for 30-50 damage per swing. Anyone in melee range is at serious risk.
TB Throwzerker excels here: Returning Pike is a thrown weapon but does Piercing, NOT Bludgeoning. Use Light Hammers or throw heavy objects instead.

Honour Mode Specifics

Grym’s Quake (Legendary Action) — massive AoE prone. If your lever puller gets proned, you can’t hit the hammer that round. Keep lever puller at max range.
Lava management — Grym’s footsteps create lava that persists. Don’t let him flood the arena. Lure him through the center each time.
Grym is immune to crits — Killer’s Sweetheart, Hold Monster, etc. don’t work. Pure raw damage only.
Two Mithral Ores — craft Scale Mail + Shield (or Splint + Scale Mail). You can find a second Mithral Ore in the lava area near the forge.
After Grym dies, you can use the forge again without re-summoning him. Free adamantine crafting.

Post-Fight

Loot Grym: Grymskull Helm (heavy armour helm, Hunter’s Mark 1/Long Rest, immune to crits, fire resistance).
Both Adamantine items forged (your choice from Scale Mail, Splint Armour, Shield).
Mithral Ore locations: near the forge elevator (lava area), and near the Ancient Forge waypoint.