The reason for this is that he functions as both a double row generator along with possessing a special Button nuke.
Servant, Assassin can be acquired through either 5 Rainbow Event Medals or by heavily grinding the Fate event dungeon. Either way, one can find Servant, Assassin in the Monster Exchange Event tab for the duration of the Fate event.
—video coming soon–
Servant, Assassin at a glance
Active: Change 2nd row from the top & 2nd row from the bottom into Wood orbs. Inflict damage equal to ATK x200 to 1 enemy. Affected by enemy element and defense. (15 turn cooldown) Continue reading Farm a Servant, Assassin