User blog comment:ImperiexSeed/Are fairies really capable of snekaing into Lucifer's Cage? If so, how?!/@comment-5120709-20120524223630

My guess is that they're not as powerful as Archangels, just more sneaky. An Archangel would probably try to force the door open while a Fairy would just sneak in, take what he wanted and just get out before they noticed him/her