Rotten Mushmom is a level 60 undead boss in MapleStory Classic World. One spawns in Someone Else's Grave (Victoria Island) every 60 minutes; it has 86,400 HP, gives 844 EXP, and is weak to Fire and Holy and strong against Poison.
ElementsFire · weakHoly · weakPoison · resistsweak ×1.25 · resists ×0.75 · immune ×0; two elements combine through the resistances rather than multiplying
In a fightRegenerates 864 HP (1.0% of its pool)Regenerates 20 MP