According to Basilisk, it self hastes at random and can kill an Elmore Soldier in 5 hits. It hit for an average of about 20HP with a decent chance of landing a 60HP whopper. It also behaved like the quest monster when tamed (cancelling it turned it into a skeleton), however while in Ettin form, it could be healed (unlike the super-zombie).

Looks like the latest server update fixed this little exploit, these monsters cannot be tamed any longer. Hope you had fun while it lasted ;)