As recompense to Mayor Khetehk of Misty Hill, the party agrees to retrieve a relic capable of seeking out a body’s soul. Before they can reach its rumored location in the Undermarch, they have to get past a Chuul infestation-- lobster-monsters, to the layperson.
Dwarven corporal Lance Marbedis suggests the relic is in the hands of the Deathkillers, an enigmatic cult of anti-undead extremists. To this end, the party ventures deeper into the Undermarch, a great underground bridge connecting the current and former capitals of the dwarves. To get the relic, an ingenious plan is hatched.
The victorious Elements learn the true identity of the Deathkillers: fallen angels who seek to destroy death itself by crushing the underworld, rumored to lie far below the Undermarch.