The randomness of the encounter with the vent tube clam made many of those that witnessed it feel that they were missing something. They had not imagined that monsters like that existed.
Yet, they had also never been this deep in to the ocean and had just seen a space in the ocean where an underwater volcano was making iit boil. Therefore, they had to accept the oddity as part of their reality.
What some of the fire mages had just learned though, was that there was a way to condense fire mana in to a small orb, and make it softly float around an area. Then that orb of fire mana could explode causing a burst of flame. It would be an excellent attack.
Regardless of this attacking one target, this would make an attack that could handle an entire army. They were all about to face an army of healing undead. The corrupted undead would most likely attack without fear since they had no sense of pain.