No Mercy is Seifer'sLimit Break during the time he is playable during the Siege of Dollet. Seifer casts a fire spell onto the enemies, spins his gunblade around, and starts focusing energy into it. In an upward slash-motion, he launches circular blades of energy at his foe. The blasts fly through the enemies and continue towards the sky, dealing exploding damage on the foes. Despite the fire aesthetic, the attack is non-elemental. His Limit Break's strength is unaffected by the Crisis Level and is treated like a physical attack with the attack power of 80.
The element the attack takes depends on the element of Amarant's current weapon, but gains no further boost from Elem-Atk boosting equipment. When used in Trance, the damage increase is by around 41% compared to the normal 50% all other abilities get.