Board Thread:Help Desk/@comment-5033526-20130720173017/@comment-12069596-20130724170721

Use a hellstone or metorite bridge and take off any obsidian items (obsidian skull and shield). You will take damage and only take 1 damage if you are using cobalt armor or more. You will get invincibility for a brief time when you get hurt so the twins can't hurt you (most of the time). This should help.