User blog comment:Pualover/Overlord Power Level/@comment-94.219.219.78-20150921153141/@comment-211.100.3.156-20151004114852

I think so too, probably around Lv 25 if Gagaran can fight OK with 1 by herself. but 2 would be tough. and it also said  that Mythril party can also fight against one of it. I don't think Lv 20-22 party can fight something Lv 30-35.

Though probably balance aspect. Its a Lv 30-35 monster but since it got nasty ability, it's power is reduced to Lv 25 Monster. Something like Whisper in Ragnarok Online, can't be attacked with non elemental melee attack.