Okay here is another boss for the group that I will allow the Spartan's to kill (or the Telethia to come in and kill.)
Uno Hound:

He's large, he has insane physical strength rivaling that of two Spartan's (due to an upgrade from the Demon General), has a regeneration factor (somewhat slow), and has a incredibly high pain tolerance. Not even a heavy punch from Raven's Nasod Arm was able to phase him. He doesn't wear all too much armor though. Even then the unarmored parts on his body are physically tough. Almost like his muscles and skin are made of metal.
He stands at a whopping 18 ft tall. The reason why he is much tougher and all than he is in-game is because:
1: He seems and looks like he should be much stronger.
2: A few enhancements of small El Shard's that the Demon General Ran gave Uno Hound to help assist Valak.
Oh yeah Uno Hound is also somewhat stupid... well at least my depiction of him is...