The half-elf, gulps, and mutters a short incantation whilst holding a small chip of mineral fished out from his makeshift component pouch. He's cast this spell once before to rousing success, but these enemies don't look as brittle as the animated objects he used it on. Still, it was important to take out as many of the small fry as possible, assuming there were any small fry.

"Age, tonitru. Concute inimicos meos!"

After doing so, the half-elf slides a few paces to the right, to put a real rock between himself and any projectiles the cultists may be wont to inflict on his delicate skin.

OOC:
Action: Cast Shatter (sphere; 10 foot radius), as positioned in the map. DC14 CON save to halve (3d8)[12] thunder damage. Inorganic creatures have disadvantage; non-magical objects not carried nor worn also take damage.
Bonus Action: Bardic Inspiration to Ghiso. For the next 10 minutes, he can add 1d6 to one ability check, attack roll, or saving throw after rolling the die but before knowing the result.
Move north, 1 square.