[Joshua]

Spell: Not exactly one single spell, but more of most of Occult's Spells that are readily available when you get access to it.
Suggestion: Occult in itself can, basically, compete with no other form of magic. It's, in my opinion, awful, and requires a full body cast and crutch from another magic to even 'work well'. Shadow Ball is a barrage now that only does decent damage on the very first possible hit, and the rest barely do any damage at all, and even less when someone blocks. The AoE spells are short-lived, and don't give much opportunity to use it's AP buff due to GCD, and having to get a good moment to land an attack. Life Steal only has a single hit, and doesn't offer that great of a life drain in my opinion.

if anything occult is fine where it is at because of its utility. An aoe that gives ap and a instant homing that drains vit? yeah its fine. also has a shield and attunes to shadow if desired. Again, its fine.

There's no homing that drains vitality...unless you mean a homing that does damage, then there's lots of those spread across the game. What I would say though, is lower drain life's damage to 3 and make it tick twice for a total of 6. Also, it doesn't have as much utility as you'd think. The one thing you listed is the only sort of utility is has aside from shield; and considering the AoE's CD and short range, it's not gonna be doing much