Killer Rabbit of Caerbannog
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Little is known about it, save from the fact that it has '...nasty, big, pointy teeth!' and '...a vicious streak a mile wide!'. It is widely regarded as the most deadly creature to ever leave Hell. No man could stand it.
Thankfully, it is only encountered in a special level- The Cave of Caerbannog. There, if a DoomGuy feels bold enough, he may engage this killer thing, in exchange for a reward that is far more valuable then anything else- shame that no one lived to see it.
HP: 500
Melee damage: 4d20
Speed: 300%