Arunic Panacea

Arunic Panacea is a potion that restores 120% of your Stamina if you are not in combat. It is valued by higher level players who are doing long dungeons, such as Kelsaik's Nest, where dying is expected for first time players. It is valued around 200g depending on the time of day on the Arcadia server, although prices may vary on other servers. It saves people a lot of time when dying, because stamina drops to 0% and takes around 5 minutes of standing at a campfire to refill. For most people, the Cleric of Restoration is a cheaper alternative if they die in the field, as they teleport back to a city anyway.

As drops
Most monsters have a rare chance of dropping Arunic Panaceas. Some high level players farm low level BAMs such as Basilisks in order to gather large amounts of Panaceas quickly. 10 minutes of Basilisk farming can yield around 7-10 panaceas.

Source

 * an optional reward from the quest Mana Out of Mudmen