Trigno is a Magma Curse user and the captain of the Mantle Pirates. Due to his curse, he is able to phase his body into magma, essentially making him invulnerable to swords, bullets, and cannonballs. Wielding the Magma Curse, this allows him the ability control magma. His NPC can be found at Savaria, aboard a damaged version of the Rumbling Caldera, stationed by the shore. Here, you are able to talk to Trigno about his curse and why he's at Savaria.