What does nostalgia even do?
Nostalgia increases your chance of receiving an heirloom from a miniboss by 0.1%.
Nostalgia bonus is affected by heirloom chance multipliers, such as Advanced Luck.
Each time you gain an heirloom while you have a Nostalgia, you lose 1 Nostalgia.
You regain all Nostalgia when you prestige.
