Wits End, make it adapt to circumstances.

Give wits end a different effect than MR stealing in a 1v1 type scenario. if 2 or more allies are nearby changes the dmg on wits end back to it being stealing mr. a more 1v1 type passive while not team fighting. like gain AS and MR, but mostly AS. gain 5ms and 2 mr per hit or something or movement speed, or ms slow resist. maybe ms only while chasing

perhaps it could also be in a 1v1 type scenario if the enemy is isolated as well.

and when more than 2 enemies around changes to mr stealing.

I find this useful because the value from MR stealing is more for team play.