So lets say I'm making a map in Minecraft. No mods, no bukkit, no anything; just command blocks. and I have this one mob that I don't want players to be able to kill.
Normally, I would simply give it a resistance potion so that it couldn't be hurt, but I want other mobs to be able to hurt it, just not players.
Is it possible to make this mob unkillable by players, but still able to die by other mobs?