Eidolon touched the exterior wall, and an emerald green glow started to surround the structure.

...

Behemoth emerged with a plume of gray-brown smoke, and the landscape shattered.  It was Tecton’s natural power, taken to an extreme.  Fissures lanced out in every direction and disappeared into each horizon.  Secondary fissures crossed between each of the major ones, like the threads of a spider’s web.

As far as the eye could see in every direction, terrain shifted.  Hillsides abruptly tilted, standing structures fell like collapsing houses of cards.

A full quarter of the temple collapsed.  The bugs I’d kept to the edges of the room could sense it as a small share of the capes who were in the entry hall were caught beneath the falling rubble.  The ones furthest towards the back.  Eidolon’s protective effect kept the remainder intact.

Wildbow, Worm, 24.5