Zogs are special items occasionally dropped by Enemies. When five of the same type of zog is collected, the player can visit Merci in Traders Path to redeem them for a reward. Zogs come in four rarities: common, uncommon, rare, and ultra rare, which determines the reward: Utopian Emerald (1g), Pure Lustrous Diamond (4g), Satchel of Elixirs, Zog Helping Horn. Zogs are tradeable, and stack up to 5.
Zogs are dropped by both regular monsters and bounties. The zog dropped is of the same type as the monster species. For example, spiders drop spider zogs. There is a zog for every species of monster(confirmation required).