- To start off with general changes:
-Warlocks limited to X Soul Shards maximum. (10?)
-Soul Shards stack.
-No abilities directly use soul shards any longer.
New ability "Soul Infusion" consumes 1 Soul Shard to provide a 10 second buff, Soul Infusion. 1 minute cooldown. Many commonly used abilities will be given a secondary effect if you're under the effects of Soul Infusion.
-Drain Life: Reduces damage taken by X%.
-Curses: Adds X% Dispel protection for debuff curses and X% more damage for Agony/Doom.
-Any summon/conjure spell: Cast time and mana cost reduced by 50%.
-Conflagrate: Cooldown for next Conflagrate reduced by 2 seconds.
-Haunt: Instant cast.
-Demonic Empowerment: Resets your pets cooldowns.
-Shadowfury: Adds 1 second to the stun.
-Metamorphosis: Lasts 5 more seconds.
Naturally, these can all be rather powerful effects. The idea wouldn't be for this to make Warlocks more powerful, there would definitely have to be some toning down done for when Soul Infusion isn't active, but overall it would create a much more interesting gameplay experience.