Relic Rarity Distribution

Relic rarity chances from elite fights, treasure rooms, and shops. Common 50%, Uncommon 33%, Rare 17%.

Rarity Roll

Rarity	Chance
Common	50%
Uncommon	33%
Rare	17%

Used for elite rewards and treasure rooms. If a rarity pool is exhausted, it falls back to the next-higher rarity (Common -> Uncommon -> Rare).

Sources

Source	Relics
Elite fight	1 (random rarity)
Treasure room	1 (random rarity)
Shop	3 (2 random + 1 shop)
Boss fight	none (gold, a potion roll, and a card reward only)

Boss combats do not drop a relic. The boss-relic analogue in this game is the Ancient relic, which comes from Ancient map nodes, not from beating a boss.