Challenger 1:Berserker
Info: can not see ,uses smell and hearing to hunt,can deflect bullets,you can only kill it with Hammer if Dawn then you can shoot it,can become lambent and then can jump
it Charges its foes and smashes them too death
She is a locust female from gears of war 3
picture

wow hes screwed

and heres a lambent one
Challenger 2: The Brute
info: charges and smashes to kill.....it is almost inpenitrable from the front well i have,it has weak areas that glow yellow on limbs on its body and thorugh it took me a while to figure this out...you can shoot of the limbs
It is from dead space...its a mass of corpses i think
heres a picture

also Isaac screwed in this picture too because this is a animation of the death at least before isaac is completely obliterated
also the brute can shoot stuff if it looses a limb
Challenger 3:flood Pure from tank
Pure from can turn into 3 things stalker
and two others

and its not goning to win because the other two are way badass and would pwn it i have to saw