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Dorian doesn't dare appear out of thin air in front of a half-marked creature until it leaves. On the one hand, this uber-mega-wizard was probably already detecting invisibility anyway, but he likely considered himself too important to pay attention to a random ant-cog. Well, and if not, then turning into an overripe watermelon also didn't seem very appealing... After the fire mages' disastrous completion of the assignments, they probably wouldn't be on the same path anymore, although Erebus himself didn't seem to be a particularly ardent hater of non-humans.