Extra mana for no apparent reason
I just closed Dungeon Defenders last night with about 8m mana in the bank; I'd had it open, mostly idle, for a few days. I opened it up today and had 28 million. Does anyone have any idea how that could happen?
But they did give everyone 20 million mana for Christmas.
Did you have shop items by any chance? When you are idle in game and you have items in your shop, people can join your game and buy it and you will get the mana.