So you guys remember the Voidwalkers around the big white stone in Nagrand? Remember that ability they use called "Pain Spike"? I always thought it was a pretty interesting ability and figured it could do rather well (with some tweaks) as a new Warlock ability next expansion.
Void Strike. Instant cast. 30s cooldown. Deals X shadow damage and instantly heals the Warlock for Y% of the damage done. The target regains health lost from this ability after 10 seconds.
* X = a relatively large number for an instant nuke.
* Y= 50% ish of X?
The interesting aspect of this ability is it has a little something every spec can appreciate and improve upon for solo/PvP play, though it admittedly is lacking for raiding except for Demonology. The second trained ability would definitely need to be raid oriented. I digress...
-Affliction would have a new talent to increase the healing done by Void Strike by a pretty significant amount. +100/200% healing from the ability. (Fits the self healing theme of Affliction)
-Demonology would have a talent to outright eliminate the drawback of the ability. -50/100% damage healed back. (Removes the temporary damage aspect and simply turns it into a hard hitting instant nuke. IE turns a situational ability into a more useful one, much like how Decimation makes Soul Fire pretty sexy.)
-Destruction would have a talent to reduce the cooldown by several seconds. 5/10 second shorter cooldown. (Gives Destro more opportunities to finish targets off with burst chains)
Overall I think it would be a very interesting spell, especially since it could have such unique attributes depending on what talent tree you're specced into. It's a shame something like this wasn't done for Shadowflame...