Revamped Mundo Passive

Adrenaline Rush Dr. Mundo regenerates 0.3% of his maximum health each second.

For a spell called "Adrenaline Rush", this is a bit dull.

I have no qualms with this being a spell about health regeneration, but it should be more true to its name.

Here is my proposal

Adrenaline Rush Upon losing at least 20% his current health within 3 seconds, Mundo gains bonus health regeneration and movement speed until he leaves combat. Both the health regeneration and movement speed will decay over time, until they reach a minimum. The buffs reach minimum effect after 5 seconds. (Initial Regen: 1% missing health per second) (Minimum Regen: 0.5% missing health per second) (Initial speed: 1% movement speed per 1% missing health) (Minimum speed: 0.25% movement speed per 1% missing health) Mundo can only trigger Adrenaline Rush by taking damage from Champions, Large/Epic monsters, or Structures. It may only be sustained by remaining in combat with one of those things.

When you get an Adrenaline Rush, it is usually in response to a threat. You have to use that short burst of energy to decide whether to take the threat head on or flee; "Fight or Flight". You have a brief moment to decide, before the rush fades.

The same goes here. If Mundo gets chunked, he will get an adrenaline rush. He has to decide quickly whether to use the speed and regeneration to duke it out or turn tail.

Edit: nerfs elsewhere might be necessary if this were to happen.