Garen's Passive Completely Blows Mundo's Passive Out of the Water
While Garen's passive requires you to not take damage for a while, the period of time late game is 4 seconds and is more than 5 times better than Mundo's passive. And Garen isn't even supposed to be the "mega health regen tank of doom that's an insane doctor with health costs".

immovable
object
right rito
's passive to make it so that it has a visible impact like these "invisible yet persistent powers" that Riot has been so adamantly against to "moments of power changes", for example:
.
and
's shield boost & duration reduction. [Patch 5.16]
's Hymn changes from her rework.
for out of combat regen and pop Sadism for the in combat regen.
Ult or
transformation) that allows