The fireballs didn't seem to have any special effect - it neither seemed to be vulnerable to fire, nor did the nearly-merged creatures seem to have any vulnerability to the explosion. Rather, they almost seemed to be enormous cells as part of the colossal individual.<br/><br/>The creature seemed to use the wall as cover, as well, making it hard to target with ranged spells, and lashed out with enormous whips made of itself, to slam into anyone who drew close. As long as he kept more than about thirty feet away from it, though, it didn't seem to be interested in harming him, focusing instead on those who drew close.