Warlock – “Expansion” [4th campaign, 2nd mission]

In my opinion, a Warlock, in general, doesn't need any magic other than Chaos. But in this campaign, it depends on the game version. In version 3.x, it's very difficult to complete the third mission with a hero without summoning. In other cases, Chaos should be mastered by the end of the mission with a full set of spells. Otherwise, it's better to restart the mission through the campaign menu (IMO).

I would take Education with Magic Affinity in the last slot to have fewer mana problems. And instead of Logistics, I would take Attack with Tactics so that the Furies could run further. There is no need to rush in any of Railag's missions.