Geminated Peril

when two of the world's strongest Shinobi stand together, a phenomena occurs. Their auras match and fuse to create an ominous cloud of slaughter. Some say, it is as if the White Horsemen circles around their battlefield. Preparing to release a beast capable of erasing all in their path. It is for this reason that Muzai and Naien are unable to fight, or go all out in each others presence. Instead, one must wait till the other is finish. or they could potentially give everyone a heart attack.