User blog comment:Linathan/Unit Spotlight: Dragoon Soul Bargus/@comment-26356319-20150510134831/@comment-26140304-20150510141356

You need two Kira leads, Metal Mimic, Spark buffer, and Lance to one-shot Maxwell. You have to time the Metal Mimic precisely and pray that the Metal Mimic lands a crit. Also, Lance is required because of his UBB, which boosts Atk equal to the unit's current Def.

More info about this is on Metal Mimic's Unit Spotlight. Hope this helps! :D