Where can I get information on Brutus (and others)

Hi, I need information and help! Is there a guide with detailed information on the monsters, including bosses that describes:

1. Exactly what amount and type of damage they do
2. Damage ranges, including crit chance and crit damage
3. armor / HP / res of monsters and bosses?

I need help with Merciless Brutus! I solo'd him in normal and cruel, but I am scared as ever in merc. I have 2 HC melee chars - a level 56 marauder and duelist. I don't wanna be 1 shot or rapidly 3-4 hit with the claw pull

Check out the bestiary provided here. Some of your questions will be answered.