Ominous

In preparation for defending against the vampire bats, all the Magi had pooled their mana, cast a joint spell, and erected a multi-layered dome surrounding them.

The first layer was made of earth, the next made of ice, the one after made of earth again, and the final and outermost layer was made of a dense number of thick, thorny, and poisonous vines.

It had been a few minutes since the dome was erected, and it continued to withstand the constant attacks of the vampire bats.

As the bats were slowly chipping away at the dome little by little, Magus Karl who seemed to be nearly running out of mana, spoke impatiently, "How long do we have to endure this?!"

Everyone knew that this old Magus had the least amount of mana left out of all. After all, he had expended quite a lot of it while finding the trail left behind by Adam. It had been more than a couple of hours since then, and he hadn't gotten any chance to replenish mana.