It could aswell drop from hardmode mimiron, but that's still an assumption, based purely on the name of the mount (Mimiron's Head).Originally Posted by Naliiz
My assumption was based on the fact, that YS0K10 has a guaranteed special trinket drop to him, whether as YS0K25 hasn't been killed yet, and the guaranteed drop from that (assuming there will be one, otherwise there wouldn't be a point to leave the last keeper up).
Furthermore, based on Ashes of Al'ar, everyone was certain they dropped from Al'ar (right, makes sence no?). They dropped from Kael'thas, last boss of the instance (his creator or whatnot, but still, it was Ashes of Al'ar so wtf?), so based on that I'm assuming YS will probably end up dropping the head aswell.
It's the blizzard's logic by the looks of things, which can also be confirmed by Sarth2D dropping a nice iLvl 226 item, and 3D dropping a mount, so YS1K drops a nice 232/239 iLevel, and 0K drops a mount.
Makes sence to me, although it could drop from Mimiron hardmode, and If it did, we'd probably know about it allready. Although if it does, it's most likely a chance to drop (RNG based, meaning that it could not drop at all).