Having just pledged loyalty to a new master, if they can't even complete the first task assigned, then their future status was hardly difficult to imagine.
You must understand, the new master had control of an epic BOSS team, and even a ghost dragon legion comprising entirely of lord-level BOSSes.
If they couldn't demonstrate their worth, they would likely be used as cannon fodder by the new master eventually.
Nobody wanted their kind to end up as mere cannon fodder on the battlefield, so they had to give it their all, two hundred percent, to exterminate these invaders!
Gill led the entire team forward, but their speed kept decreasing.
There was no helping it; the BOSSes inside the undead castle were just too difficult to deal with.
Apart from the initial probing, all subsequent attacks were group ambushes, each time targeting them unexpectedly.