Infinite Spawning Abyss - Terrace Map

In Terrace - Used Abyss Scarab. Abyss Spire was spawned, then after I killed it, there was an abyss fracture moving.

It moved inside the ramp in the terrain itself and spawns endlessly without pause.

Enemies do not drop items, but I am unable to finish Abyss and receive rewards. Thank you!