((What, no "Team up with the people who blasted your army to bits to defeat That Other Guy"?))
(one, he is *spoilers go here later when i can format* and two, he deems the dwarves to be a worse threat at the moment, being closer to him than the Far East.
His plan is to build a sizable army and attack the dorfs to capture the masterminds behind the spell, and then with all the local mages available, march on the far east. On that note, he is still quite evil for the moment and definitely does not care if all the dorfs die. Heck, it is implied that villages that resist are slain and turned into undead draftees. If that is not dark and evil enough, nothing is.)
((Hmph. Well, thanks for telling me your plans.))
"Dammit. We need sizeable zombie defenses up, stat. The necro's gonna march on us before going to Out East."
On that note, I quickly move to produce antipersonnel defenses.
(Oh come on! At least implement it in a way that implies it was news from the caravan!)
((Sorry, but due to certain backstory shenanigans, like the stuff that resulted in me posting here, playing the game, and existing IG all at the same time (repeated gameception across fora, games, and in-game games and fortresses, happy fun joytime), Amp explicitly said I can outright know the meta. In key fortress-defense situations, like a necro invasion, or significant hints about Out East, I'm gonna use it.))