Billy frowned when he read that message… It seemed that demi-humans on that continent didn't leave in peace. Billy had considered that one or two reincarnated individuals had been reborn among them, and considering what he had just learned, it wouldn't be weird if the necromancer was a demi-human and was trying to gain some power and win some battles there. They either wanted to protect their people, or they wanted to become the leader of all the demi-humans. Those seemed the most obvious possibilities. Either, some more investigation had to be done before he could really reach any conclusions.
Billy asked for more details, but it was hard for Icarus to find time to write anything. While he was fast, using his speed in most things would destroy them. It was a bit annoying, but Billy knew that the failure of a core he gave him wouldn't last long, so he told him to retreat while he prepared some new tools to help him.