This can be a new dark divinity or a temporary item.
Original idea:
When you defeat a boss without taking damage you have a 50% chance of the next random box be a bonus stage box.
Balance ideas:
1- Instead of guaranteed excellent before 90s fight you get guaranteed bonus stage box before 90s of fight
2- When you defeat a boss without taking damage you have a 25% chance instead of 50% of the next random box be a bonus stage box.
3- When you defeat a boss without taking damage in 60s you have a 50% chance of the next random box be a bonus stage box.
4- When you defeat a boss without taking damage your next bonus stage box has 75% change of a boss fight
