[Chaos]

You don't even need a Red Letter to counteract Spatial Corruptors; as long as you have enough elemental resistance to force a Resist!, you'll slow them down long enough to take them out. (It's not hard to get items to resist their spells, as well) If you happen to have a method to inflict Silence, then you're golden. Seriously, there's enough ways to counteract Corruptors here, folks.

That being said, they could stand to have their Poison/Burn levels lowered, and while having a lot of HP isn't a bad idea, giving them substantial DEF/RES is going a bit too far. Spatial Horrors being able to tank is one thing, but Corruptors have too much offensive power going for them.