Ice Queen

The Ice Queen is a boss in Golden Sun: Dark Dawn, found in Harapa Ruins. She battles your party when you approach the end of the dungeon, select "No" at the first dialogue option, then select "Yes" at the next dialogue option. Her power reverses the Alchemy Forge, while her Mars counterpart, the Sand Prince, reverses the Alchemy Well. Being Aligned with Mercury, she is weak to Mars Psynergy and immune to Mercury Psynergy.

Defeating this boss gives the player the Ice Queen Stone (item), which when equipped to a Mercury Adept, bestows the Cold Snap Psynergy.