What — Venomous troll-like creature; arena beast fought in the Gwyndinas arena.

Threat — Deadly. Pushed the party to their limits across a gruelling 9-round fight; Legendary Resistance + DR + a building AoE explosion. (Session 12)

Observed abilities

• Venomous claws — every hit rolls a poison table inflicting random debilitating effects (twitching, toothache, drowsiness, lung seizure, slurred speech, itchiness, jelly knees, hair loss). One effect — lung seizure — blocked dashing and forced a DC 17 Con save or suffocate (Silithane hit, passed). (Session 12)
• Skin charge-up — built over rounds toward a 20 radiant damage AoE explosion, triggered by a critical hit. (Session 12)
• Legendary Resistance — burned once to shrug off Thalia's Entangle. (Session 12)
• Physical damage reduction. (Session 12)

(No AC or HP numbers recorded in the notes; transcripts had no Gravek line to mine.)

Resistances / immunities / weaknesses

• Physical damage reduction (observed). (Session 12)
• Legendary Resistance vs. unwanted conditions. (Session 12)
• Weakness: forced-movement combos. The "boom and drag" (Silithane's Booming Blade + Thalia's Thorn Whip) was highly effective and landed the kill. (Session 12)

Tactics & behavior — Melee bruiser: wades in, claws to stack poison, soaks hits via DR/Legendary Resistance while its skin charges toward the radiant blast. Note the crit-triggered explosion — avoid feeding it crits. No flee/surrender behavior observed (fought to the death). No evidence on whether it fears Fenric or spellbreakers — gap.

Disposition to the party — Hostile (arena combatant).

Status — Dead. Killed by Thalia via the boom-and-drag combo; party harvested 6 Gravek claws and its hide, then levelled to 4. Last seen Session 12.

SUMMARY: Dead arena troll; poison claws, DR, Legendary Resistance, crit-triggered radiant blast.