Warlock – “Cultist” [Campaign 4, Mission 3]

Generally, everyone had problems with this mission. I did too, when I played it for the first time. I even thought about using cheats, but they didn't work for me. Can you tell me what difficulty level you're playing on and which version of the game you have?
As for your character development, it seems fine. Just remember that instead of Attack, you definitely need Chaos. Warlocks are developed this way – racial skill + Chaos. This is the foundation.