ArchBlade said:
Deathclaws.
I say this because 5 of the mofos came at me at once when I as level ten.
I crapped my pants.
you see this is why you dont go near old olney. though unless your me and playing unarmed specialist but then to get our deathclaw hand you go to the trailer park which only has one of them(which i killed at level 2 on very hard

. but yeah they were pretty scary the first time round i fell down into the old olney sewers at like level 8 just venturing around looking for oasis and got killed

. but now i have charon with me who carries the strongest assault rifle in the game so with my deathclaw gauntlet and his murder rifle things go pretty well.(most we took on was i think 6 i spawned them)