Robes of the Last Illud Archmage:

Upon being equipped, the wielder’s negative quirk is magnified, causing a −1 penalty to all Mech-RPs it would be pertinent to. (Up to RP mod on equip) The wielder’s Magic stat is increased by 2 and may bypass stat capacity. For every 3 Character Magic Points the wielder has stored, spells cast against them suffer a −1 penalty. The wielder may use Character Magic Points as if they were Nation Magic Points, and vice versa. If the wielder unequips this artifact, they lose 2 Health States. Reequipping this artifact magnifies the quirk again, increasing its negative penalty by 1 each time. At the start of a war session, the wielder may summon The Crystal Serpent, which takes up a unit slot.