Hello,
i just want to show you how i play Mundo.
Please comment this build i want your feedback
(sry for some bad english ._. )

For the Runes i think you need armorpenetration todeal some dmg
the cdr is pretty nice for his cleaver and ult
and i take the health runes because my first item is the ruby cristal so i can get more than 800hp at Lvl 1 i think its nice

Offense down to armor and magic penetration, improved ghost and defense until more health seems the best alternate to me

The Items are a bit expensive but the main items to get are Spirit Visage Frozen Mallet and the Impaler these are my core items and this should be able to get in a normal game

Mundo's only CC is his cleaver and i think he needs more so i take exhaust and ghost ist overall a good choice

this is my first "guide" ( its more like an idea) so pls comment
im succesful with this build and maybe you will try it :)