Poltergeist
The two Balou died, their corpses remained on the ground, continuing to bleed. And, followed by mild thumping sounds, the dust on the damaged buildings fell as a figure outlined itself.
It was a Ras, in its adult form. It arrived before the two Balou carcasses, opening its mouth to clamp on them, crushing them with a single bite. Within a few bites, it swallowed both the Balou. Its body bulged because of that as it sat on the ground, barely able to move as a result.
But, just because it was in an inactive state didn't mean they could try to swarm it to death. Since the Balou of Re'Rel and Re'Fua had died first, Re'Kha and Re'Gra took the turn now to send their Balou.