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Thankfully you can take 8 secondary skills and there's plenty to choose from... You can take:
Necromancy, Armorer, Offense, Logistics, Earth Magic, Tactics, and then whatever you like, even Intelligence, Resistance, Wisdom, or maybe some other magic!
Added after 4 minutes
Delay against a Necromancer is akin to death! Even though the Cloak of the Undead King artifact usually can't be assembled, by month 3 there will already be tons of skeletons and your angels, upon hitting them, will simply fall from the retaliation... The main thing is that skeletons are free power!!! Not to mention that Galthran can visit conservatories and utopias as early as week 1, so you know... ;)
Added after 7 minutes
It's best to take Shakti as your starting hero, but that's a matter of taste...
But I strongly advise you to radically reconsider the development plan!!!!! :eek: