mirrors has a drop rate same as atma but its bit higher 5% i believe been farming lev x a full day and never seen one drop but its random tho. mirrors can drop day or night time in game just way i read and heard from ppl on behemoth server some got mirrors dropping every few hours due to having wave weapons equip or that person already own one in there invetory but its what i heard and read no more. just wanted give you a helpful tips. and cant wait transfer to this server happy hunting all