Lady Ffion Meilyr is the leader of the Meilyr Clan of elves. During Plague's End the player makes a potion that allows one to see a portal in the Daemonheim Castle that leads to the hiding place of Lady Meilyr. After finding her she travels to the entrance of the Grand Library and with the help of the player, the other six clan leaders and Iestin Edern, defeats the Dark Lord and activates the Seal of Seren.
She now resides in an oval building in the north-east part of the Meilyr clan district in north-eastern Prifddinas off the north path. Here she gives access to the Meilyr Clan Store and the Recipe Shop, where players can purchase potion recipes.
The Recipe Shop can be accessed by talking to Lady Meilyr. Scrolls indicate combination potion recipes which the player has not yet discovered, potions with a tick indicate potions which have been unlocked, and potions without a tick indicate potions whose recipe has been found but which have not yet been purchased.
Recipes can be found in Dungeoneering and from the Motherload maw. Once a recipe is unlocked it must either be purchased or a second copy of the recipe found. If a second recipe for the same potion is found, the potion becomes available without paying.
There are no level requirements to purchase potions. Thus, players can use Herblore boosts to make these combination potions.
Players can obtain a one-time Melee XP lamp by giving a Super melee potion to her. Simply giving it to her does not work though. Players must talk to her, select "1. What can I do here?", then "3. Ask about combination potion recipes". She will then ask "Ah, I see you have a super melee potion there. Can I have it?". Upon giving her the potion at this point, she will hand you the lamp and exclaim: "There you go, but don't lose it. That's the only one!".