the only similar thing about aetherflow and lifetap is that it gives mana, well lots of MMOs have spells that gives back mana, it doesn't mean that it's "ridiculously similar to lifetap", lifetap is spammable, aetheroflow is not, lifetap gives mana in exchange of hp, aethrflow doesn't do that, aethrflow gives 3 charges of aetherflow, lifetap doesn't.

//DS deals more damage the more dots are active. Maybe I didn't explain it well enough.//

haunt is from WoW, DS = (I'm assuming demon soul?) is from WoW as well. you compared haunt to fester, and both of this spells(haunt and fester) are way way different.