What is this item?

I received it, but I can't find where it is.

Still empty :D

The rewards for these kinds of quests are usually platform system items, not in-game items. They are mostly used to boost experience or for auxiliary functions, so you don't need to worry too much about not finding them.

Carnival event, you can draw prizes.

You usually get items for event lotteries~ Check your inventory and see what events are available.

Yeah, it's a dice that makes no sense.

I want to know too.

There's no such quest.