Morgana Passive idea.
Passive: Morgana's abilities create Torment. Torment deals %Missing HP damage and heals Morgana. The way it manifests is different for each ability. Q - Adds a burst of Torment behind point of impact. Basically Lissandra's Q with a shorter fallout that reaches halfway between melee and caster minions. Slight boost to Zoning potential and dmg output. E - Recipient's autos apply Torment, or they receive a Thornmail-like effect applying Torment to enemies attacking with abilities. One or the other. R - Applies Torment while the tether is active.
W: Still just Tormented Soil :)
In my opinion, Morgana's playtyle is already pretty strong and cool for the most part and she just needs to be a little more interesting. Don't think she needs a huge gameplay rework, just a few more interactions and options.