Surtr

 is a boss enemy found in Götterdämmerung.

Skills
Scathe of Branches: A++
 * Increase own attack for 1 turn.
 * Reduces their Debuff resistance for 3 turns.
 * Inflicts Burn to them for 3 turns.

Monstrous Strength: B+++
 * Increase own attack for 2 turns.

Gigantic Shell: A
 * Reduces own damage taken for 3 turns.
 * Restore HP when damaged for 3 turns.

NP
Shine Brighter than the Sun, Flaming Sword
 * Deal damage to all enemies.
 * Inflicts Burn to them.