Crown Rite: burns 100 Charred Crowns and a Sialogogue to push a maxed tier 20 pet beyond the cap, to the Ascended tier 21. And for the truly committed: an Ascended pet leveled back to 100 can attempt the rite again, at double the cost, to become Transcendent at tier 22, the final tier. A Transcendent pet works twice as fast at its specialty and digs up far richer gem bags.
Minibosses have a 50% chance to also drop a bonus Gem Bag. That bonus bag is awarded to one player who qualified for a Small Gem Bag (weighted toward the top damager, but any qualifier can win).