Cursed MvPs are like the Chapter MvPs except that they are stronger, have twice the drop rates, can drop elemental charm cards, and are only spawned during Black Moon (they are also purple, have a purple aura around them, and are much bigger in size!). After a summoned MvP is killed, there is a 50% chance that its cursed version will be spawned nearby the kill. When it's about to be summoned, there will be a server-wide announcement saying: Each cursed MvP drops a Seal of Exorcism. Three seals are the minimum requirement to be submitted to Petra in order to receive a prize.