Here’s my idea:
It could be called “Ritual of Dominance” and it’d require two people to perform. The warlock would find the demon he wants to perform the ritual on and while in a group with another person, you would approach the demon within 20yds without aggroing. With the other person standing within 5yds, the warlock casts the Ritual of Dominance and channels a 6 second cast, similar to hunter’s Tame Beast. At the end of the cast, the demon becomes your pet and the other person in your group dies as their sacrifice was required for the spell to work.
You’d have to feed them and feeding them isn’t the same as a hunter pet… no, you’d have to feed it a Demon Stone once per week, created at the Altar of Storms in the Blasted Lands, that reenergizes the bonds of your Ritual of Dominance spell.
To do this, you have to catch critters and one won’t do. You have to bring a dozen critters and place them on the Altar of Storms with 3 healthstones and 1 soulstone. Then you’d need to cast Drain Life on the critters. This will create a Demon Stone. You then place the Demon Stone on the ground and your enslaved demon will begin feeding on it. While it’s feeding, you have to recast the Ritual of Dominance spell. If you fail to feed it, at a random time during the next 24 hours, it will grow up to twice it’s size. And then for up to the next 4 days, your Demon will do 150% damage as your spell over it weakens and it seeks to break free.
If you feed it a Demon Stone and perform the ritual, you will reset him back to normal, but he’ll lose the damage buff. If you choose to keep the buff, then during those 4 days, he will randomly double in size again, turn aggro, become an elite mob with 200% health and do 250% damage, but only attackable by the warlock who enslaved him. The warlock would have to either regain control over the demon or die.
To regain control, you have to beat it down to 25% of it’s health and place a Demon Stone on the ground and perform the Ritual of Dominance while it feeds. If it kills you, he despawns and is gone forever. If you don’t have a Demon Stone on standby in your bags, you have to either kill it or it will kill you.
This could boost warlock DPS in raids and dungeons… but there’s always that chance that the demon will break free and turn on the warlock. Do you crave power and glory? Or do you prefer to play it safe and feed your demon in a timely manner every week?