So i dont know if this is a bug or intended but i just had a game with a mundo who 1v5 a full build team. we couldnt do any dmg to him. He had over 400 Hp/s and when he ulted it was over 700?
How is this possible?
Mundo heals as much as he pleases
the health regen changes. just wait until a 9/21 garen gets 
did any of you had any last whispers or void staffs?
A SV, Warmogs Garen heals insane amounts out of combat. it's something ridiculous like 800+ hp/5
Mundo has 20.5 base HP5 at level 18. SV would double that to 41, and let's say he has a Hydra for +15 (so 55).
Then you've got Warmog's, which is 1% of max health per 5, increasing to 3% per 5s out of combat. If he's got 4K health that would be an extra 40 HP5 in combat, 120 HP5 out of combat.
Then SV multiplies all that by +20%. So he could have about... 120HP5 in combat, maybe 200ish out? That's about 25-40 HP/second.
His ult at max rank is 60% of max health over 12 seconds. Plus 20% from SV, so it's really 72% of max over 12 seconds. With 4K health that's 240 health/second, ~1200HP5.
In terms of effective health you have to consider armor and MR too. A full build tank Mundo is VERY VERY tanky.
