Arachyura

Arachyura is a monster found in the expansion Labyrinth of Ruin.

Description
It takes many, many years in the deepest of underground caves for a simple spider to mutate to such an absurd size, but thus far their reclusive nature has typically led them to be seldom encountered. Why these terrible creatures have emerged from their dark hovels is unknown, but it bodes ill tidings for all the surface dwelling peoples.