Chicken Harpy

An encounter-able NPC in the High Mountain.

This female Harpy strangely resembles a chicken, similar to how the Cockgobbler resembles a turkey. Unlike the rest of her kind, this Harpy does not want to attack the player; instead, she roams the hills with a cart-like setup containing eggs large and small, of all the various possible colors, and will offer to trade them to the player. However, she will only trade an egg for bottles of Ovi Elixir, requiring two bottles for a small egg and three bottles for a large egg. It's implied she uses the ovi elixirs to restock after the PC takes her eggs.

It's possible the Chicken Harpy cannot be found unless the PC has at least one ovi elixir in their personal inventory, at least for their first encounter. [I found her without Ovi Elixir, shortly after reaching level 24, so it could be level based.]