Time for a New Ferocity Mastery - Bring Back Expose Weakness!

Remember that Mastery in Season 5, "Expose Weakness" that allowed you to increase allied damage to an enemy for 3 seconds after damaging the enemy with a spell? It has occurred to me that, as a Zac jungle main, that if this mastery was re-implemented in some form, it would benefit junglers as they could help their allies secure a kill during a gank. This mastery, with the right adjustments, would give players and additional option besides double-edged sword and feast in the Ferocity tree, especially for junglers and teamfighters.

In addition to that, this would be helpful for junglers during the leash phase, as it allows the monster to be killed more easily with the help of the additional allied damage from the mastery.

Riot, please consider this proposal and if viable, please implement!!!