All equippable items that raise or lower the Adept's power of the Mercury element independently from and in addition to how many Mercury Djinn the Adept has Set onto him or her. As of The Lost Age there is no equipment that lowers Mercury power.
“A Triton's Ward is a Clothing-class piece of armor found in Golden Sun: The Lost Age. It is...Triton's Ward
“The Clear Bracelet is a Bracelet found in Golden Sun: The Lost Age. It can be obtained by giving...Clear Bracelet
“A Planet Armor is an Armor-class piece of armor found in Golden Sun: The Lost Age. It is...Planet Armor
“The Spirit Gloves are a Glove-class piece of equipment found in Golden Sun, and are not to be...Spirit Gloves (Golden Sun)
“A Spirit Armlet is a Bracelet-class hand armor found in Golden Sun and Golden Sun: The Lost Age...Spirit Armlet