Prosperity is a divination card. A set of ten can be exchanged for a magicGold RingGold RingRequires Level 20(6-15)% increased Rarity of Items found with the Perandus'Perandus' Prefix (25-28)% increased Rarity of Items found prefix.
(Undocumented in patch note) Prosperity now also drops from Mao Kun, Whakawairua Tuahu, Beach, Reef, Atoll, Wharf, Maelström of Chaos, Coral Ruins, and Tropical Island
Many divination cards that drop in maps now drop in additional map areas. In most cases their existing drop locations have not changed, and those cases have not been patch noted individually. Atlas reshuffles will mean that some of these locations will not be available in any given league, but checks are in place to ensure that every divination card available in maps always has at least one map present on the Atlas.
(Undocumented in patch note) Prosperity now also drops from Estuary, Peninsula, Port, and Strand