[quote=@VeyrinDay]
system-wise, revelry is something your char must do if they get mixed result from loot roll [b]and[/b] he/she can't take more gold

revelry [b]may[/b] result in bad things, for example, my char's Revelry in Occult might attract a powerful spellcaster to raid the dungeon
[/quote]

additional info:

Loot Rolls resulting in Failure starts a Revelry, each Revelry fills one Dark Heart

Revelry being done when your character has more than two Dark Hearts results in Overdo, that's when the bad thing happens in Calamity phase just after Downtime