Dr. Mundo Build
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Mundo is a very good hero to use for many reasons, maybe you like how he can stay in a lane for what seems to be forever or that he has an amazing damage out-put while still taking a ton of damage and healing through it himself. I like him for many reasons and i feel this build best enhances his playstyle. his first spell doesnt even beneft from items so ignore that already. His second spell gets a minor buff from AP not enough to matter...skip it. And his third spell enhances damage so ignore it as well! :D. And then his final heals you and increases speed. skip that as well. Now for my rune choices...i dont actually have these runes they are just the ones i would use so its up to you on that. I would normally just take top or bottom and level up normally kill what you can and what not. By the time your level 11 you should be getting plenty enough kills to get you decent armor. And by end game you should be detroying face and be near unkillable.
Sorry for the meager guide, i tried :D good luck
added note - in some situations, depending on the team you face, boots of quickness the 3 speed ones can be better, i use both just decide what would be best in the situation.