Do you really want your non necro non illusion build to be landing your spells in endgame reaper? Wouldn't this be an insult to those have built dc specific casters squeezing out every last drop of int or cha or wis trying to land DC's in difficult content? You have a mutt build that might be fun to play on the tr train but for challenging end game stuff should it be that easy? You really dont want that do you?
I'm not saying your build cant be viable and supportive in end game content but gear up and figure out what you can and cant do. Dont expect to finger and pk high forts. hold them and throw some dps and maybe pop a finger a caster now and then. Maybe throw others a heal or 2. End game high reaper takes some practice to be viable in.