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