Warp Blast

From Exterminatus Manual

The Tyranid Zoanthrope is a very specialized breed, it appears to be a genetic combination of both Tyranid and Eldar DNA that results in a creature with powerful psychic abilities, including it's primary attack the Warp Blast.

By drawing on the energy of the warp the creature can focus on an area and direct a large focused burst of this warp energy into it creating a large explosion of exotic matter that is highly damaging to anyone caught within its blast.