I have a character that is level 8 with the saw and everything and he cannot even damage the first Killer Gator in the dungeon to find the Giant Swamp Viper. I double checked the "new hunter's" scroll and it said Killer Gators are still for level 6. I went back with full blessings and was able to deal 5 damage to it before I almost died. I think something might be up.
EDIT: Maybe not invincible, but certainly a lot harder than he should be.