Aethereal drain bug

Whenever I put an aethereal drain item on,my mpregen goes to 0 and it won’t let me enter the arena it keeps saying no match found

Aethereal Drain is like Vampiric Touch, in that you replace MP by causing Elemental Crits at the expense of losing your MP Regen. you can still restore MP in other ways as long as it isn’t Regen. if your Elemental Crit is low, then you are going to have a problem with MP. MP on Hit or MP Leach are good solutions, or any other way to get MP, as long as it isn’t MP Regen.