Mekanism obsidian Armor helps a lot with those critters. In RR I tend to go to the twilight forest before the nether just to get atlarus & adamantine. They're used to make tartarite which makes you nigh invulnerable. I don't tackle any chocoquest dungeons without either of those armors.I play Resonant Rise, so if I try looting a Better Dungeon I'm just going to get swarmed by a few dozen 20-health, enchanted-dia armor godmode killing machines lol.
You could also be cheesy and just drop a quarry on top. Either way you can clear one and end up with almost everything you need to get an AE network going.