Lucid Barrier is one of three spells taught by Lumina, the Mana Spirit of Light, in Secret of Mana. It is a defensive spell that renders the target immune to a set number of physical attacks.
Primm can cast the spell at a cost of 4 MP. It is also cast by Mystic Books in the Ice Palace, Kettle Kin in the Grand Palace, and Terminators in the Mana Fortress.