They realized the six spots all had magma with the same magma crocodiles swimming inside of them. Nero, recalled her group far away from where the smoke was, and looked at Ainz as they reviewed his thoughts about the sixth floor.
"Can't we just launch spells until they are all dead?"
Nero spoke with a frown, but was immediately replied by Ainz.
"We shouldn't forget, they can always hide themselves at the lake, if we put aside their strong defense, and if we just launch attacks like that, the power behind our attacks would just be drained before it even gets to the magical beasts thanks to the magma corrosive heat.
"While the crocodiles are not strong, their defense and environment always make up for their weaknesses is why they never leave their terrain until they have weakened their prey."