An update to Kayn's passive
Live
When you deal an instance of direct damage to an enemy champion, they drop a red/blue orb. When you exit combat, absorb these orbs and gain essence based on the current game time.
You have two essence bars, the most progressed of which is shown on the HUD. When one bar fills, its form will become available and the other will go on a 4 minute CD.
Proposed
At game start, your blue and red form start on a 14 minute CD each.
Instead of filling a bar, gaining essence applies flat reduction to the CD of either your blue or red form.
When one of your form's CD's reaches 0, you gain the ability to take that form in the fountain. If a form is available, further essence into the other form will reduce its CD by half the normal value.