Vana'diel Bestiary: Scabrous Slug  

I recommend these guys at 58 bst for some decent exp. You will have DC, EM and mostly T's. Also, with all the sigil bonuses, you cant go wrong. They do HEAVY damage to each other. (and you....) You cannot use their TP moves because it heals them, also another great thing for Bst. They do have a AoE Corrisive Acid attack that lowers Def and Atk. Does about 150-200+ damage from a T. They can strip your equipment and make your JAs unusable if you get hate. I usually started fighting with pet once my pet hit him twice and I never got hate. They repop fast too. I would say 5-7min.

My three cents.