Blizzard's doing their part for charity this festive season by pledging the money you use to purchase a pet in World of Warcraft towards helping sick children live out their dreams if you buy one before the end of the year.
Mischief, the Fel kitty, is a release in line with WoW's current expansion Legion which sees an awful lot of demons and the Fel-tainted popping up everywhere causing trouble. Mischief himself isn't that bad, costing you only £9 or $10 to adopt and have ready to stand by the sides of all of your characters tied to your Battle.net account. And all of that money, 100% of it, will be given as part of the donation Blizzard will be making to the Make A Wish foundation.
If you'd rather have a softer, more physical version you can do that too. There's a plushie of the Fel kitty available in the Gear store for $25. Not all of that goes to charity, but at $14 that's still more than half of it going to good causes.
If you want to support Blizzard's efforts, you have until December 31st to buy the pet in-game.