Mist Potion

A Mist Potion is a consumable item in the Golden Sun series, first introduced in Golden Sun: The Lost Age. Like most consumable items, each party member can hold up to 30 mist potions in a single inventory slot. When used, a mist potion restores 300 Hit Points to all party members; if used in battle, only the four currently-fighting Adepts are affected. Mist potions can be bought for 9000 coins and sold for 6750 coins. Also, mist potions are considered Artifacts, meaning they can be re-purchased if sold or dropped.

The Lost Age Mist Potions
In Golden Sun: The Lost Age, a single mist potion is added to item vendors' Artifacts section the first time players visit Contigo and Loho. Also, a limitless supply of mist potions can be bought from the item vendor in Prox, curiously appearing in the shop's "normal item" stock despite being an Artifact.

Mist potions are dropped by Grand Chimeras and Ghost Armies.

Dark Dawn Mist Potions
In Golden Sun: Dark Dawn, a single mist potion is added to item vendors' Artifacts section the first time players visit Border Town, Yamata City, and Tonfon.

Mist potions are dropped by Kobold Kings, Earth Lizards, Chimera Mages, and Mad Demons.

Analysis
Mist potions are the only consumable items that restore HP to multiple party members at once. While this does make them useful, it is up to individual players to decide whether or not their staggering price makes them practical. To compare, vials restore 500 Hit Points - almost twice as much as mist potions, although only to one character - and cost a mere 500 coins; normal potions, while more expensive than vials, only cost 1000 coins, one-ninth the price of mist potions. Easily the most expensive consumable item in the series, many players may be better off not investing in mist potions until after optimizing their equipment setup.

To further cast doubt on their practicality, mist potions are only the second-most effective group healing technique. The Pure Wish Psynergy restores 400 HP per Adept and only costs 20 Psynergy Points, a relatively low cost during the later stages of a game. On the other hand, even after manipulating the party's classes, only a few Adepts will possess the Wish Psynergies, whereas everyone can carry mist potions, making them effective backups should a designated healer be incapacitated.