Zombie Goatman

Add a rare zombie pigman style mob, a "zombie goatman" to the nether that acts with zombie pigman, if you attack it, zombie pigman will attack you, and if you attack a zombie pigman, they attack you. make it healable to get the goat mob, which you would then be inclined to bring back to the overworld for goatmilk, or some other possible trait. Goats would not spawn in the overworld.