Make Xin Zhao's Ult max health% damage
His ult takes approximately a second to utilize in order to do approximately 15% current health + base 75 with a terrible ad ratio. With this considered you must also understand nearly every engage start with an e to get to the target which does nearly 15% of their health. Most players also use the w and q combo on impact to maximize damage dealt. This very quickly does more dps than with using the ult. In order to do the most damage in about 95% of situations the ult is worthless. To have his ult be useful riot needs to make it to % maximum health in order to deal the final blow from range which could be helpful or remove the tag his autos give so that the knockback could not be canceled and was always available. Thank you for realizing his ult is the reason he is poorly played and not his w.