That was a big ask with every progamer player. He got HUGE BUFF in his items, most is in this Tank Update (7.9) about HP. So, let's get started

Hello i am PTP and i play on Vietnamese server (GPL). I am a support main and support picks such as Mundo. I am unranked right now since the season is coming to a close for season... 8 however im not a good support player! But maybe i still a good supporter...

So this guide is for Dr.Mundo Support if you fancy to try him out. He can get ahead, stay ahead, and often times carry your team in ways people cannot imagine and its a much better feeling than normal since your the support role this time around !

So, the pros and cons of Mundo

Pros:
Ability good recovering
Short Cooldown time
Damage is very consistent
Style aggressive play suitable for positive ADCs
Very high mineral health and sustainability
Possible to wander and solo most enemies
Can create a surprise in the fighting with hold someone back


Disadvantage:
Not have much for support skills
Weak damage
Can burn your HP massively in the initial transaction
Can easily be caught dead by many enemies
Need a good time to protect kills

So for the runes... there are a lot of choices but these are the most straightforward for the laning phase and can help stomp early.
+ 9 Greater of Armor
+ 9 Greater Seal of Health
+ 6 Greater Glyph of Cooldown reduction
3 Greater Glyph of Magic Resist
+ 2 Quintessence of Health
1 Quintessence of Percent Health

I will explain them as simply as i can. You go for 0/12/18. For your keystone mastery, you can go with a lot of options depending on how you play but for me i wanted tank sustain.
+ I used Stoneborn Pact. This masteries give you 5% Maximum Health and recovery health to your Team (in general) and ADC (in particular)
+ So for the Resolve points, 5 points for Recovery for the extra sustain, 1 point into Explorer to get you're faster when hiding on bush or go to the other lane to gank, 5 points into Runic Armor as it buffs your Passive, Q and R heal and recovery, 1 point into Perseverance for the recovery once again and lastly the point into Stoneborn Pact. Into the Cunning tree, 3 points into Wanderer so you can roam faster and get back to lane faster, 1 point into Secret Stash for stronger potion effects, 5 points into Merciless for the extra burst damage to low champions since you cant use mana and lastly a point into Bandit for auto attack gold and minion kill gold.

Other masteries you can use:
+ Windspeaker's Blessing - Your recovery ability (and shield) is stronger by 10%
+ Deathfire Torch - Up take it if you wan to harass enemies
+ Warlord's Bloodlust and Thurdelord's Decree - if your going for an AD sustain Build which is very possible since Mundo is a close range fighter.

So Itemization is pretty important in most cases but with Mundo its usually the same build over and over again because its what works but there are some exceptions.

The Starting Items, when starting your match you pick up the Relic shield, 3 potions and your warding trinket.

Relic Shield is super important when starting off because of its passive. You can kill minions for your adc and get the kill gold for both you and them and keeps his CS high, as well as it heals both of you for some health and it even earns you 2 gold per 10 seconds and gives you a bit more health to pull from for your cleaver.

For your Main Core Items that will usually Be built.

Face of the Mountain - This is your first built item. It gives you the gold passive automatic .Also it give your Health, Base Health Reneration and 10% Cooldown and most importantly is gaint a shield by 10% of your maximum health.

At tanker, 30 armor and Blocks 12% of the damage of Basic Attacks is better for Mundo.

Warmogg's Armor - This is a very selfish Tank item. it gives a ton of health and an insane regen and some cooldown but rarely will you build this item. it doesn't add anything to your damage, or anything for you team to make it beneficial.

Spirits Visage - The Main Key to your Sadism. you Recover a very large amount of HP and the passive of this to increase that amount by 30% is HUGE for Mundo. The Health, Magic Resist, Health Regen and 10% cooldown also makes it worth it.

Dead Mans Plate - This is a very nice useful item to Mundo. you get more health, armor and a a very powerful movement speed passive buff and an extra damage burst for your masochism empowered auto attacks

Sunfire Cape - Another very useful powerful offensive item for Mundo. gives health, and armor and a magic burn passive that can do a lot of damage in a short amount of time. when combines with your burning agony can deal a ton of damage in a very very short time and succeed in landing you easy kills

Situational Items:

Randuins Omen - This armor item gives the same stats as the sunfire and dead mans but with a very nice team play based passive. A very strong active enemy slow as well as attack speed reduction and reduced Big Crit damage. this item is best used verse some fast enemy teams with fast assasins or when you want to team fight and get alot of damage done in a little bit of time.
...also with:
Thornmail - This is great against enemy AD compositions who have alot with norman attacks. Great against enemy ADCs and certain carry heavy champions such as Ashe, Kayle, Kalista, Yasuo, Riven, Miss Fortune, Jhin, Lucien and other champs

Guardians Angel - this Item is selfish but very good. You should build that at late game and fastest you can. It makes you resilient to all forms of damage and makes it a waste to try to kill you. as the main tank you will be often times peeling the damage for your carries and making it a waste to kill you is a pretty nice troll at the end of the day. Killing mundo once is hard but doing it twice? HA HA HA IN YOUR FACE!

Now for the skills. Its pretty simple and straightfoward.

The Passive - Adrenaline Rush - You regeneration 3% of your Max HP every second-this can be amplified by the Runic Armor, Windspeaker's Blessing mastery skill and Spirit Visage.

Q - Infected Cleaver - You throw a cleaver that damage according to your enemies HP, this skill has a really short cooldown time and can do up to 300 average damage when maxed, it is also a decent form of health sustain for mundo if you land the skill however it is a skillshot so aim is key.

W-Burning Agony - This skill is very risky to use early on. Every second that the skill is active you spend your HP however in return you get an AOE Burn damage like the Sunfire Cape but you do get a CC time reduction.

E - Masochism- your main source of burst damage, it scales heavily on AD and makes your auto attacks do a huge ton of damage. The more HP you have missing from your max HP the more damage this is going to do. At full Build you can do over 700 damage with your auto attacks at half health without any AD items.

R - Sadism - The main reason you can roam so much. At lv 3 you restore 75% of your max HP in 12 seconds. You also get a ton of movement speed and when combined with your boots and dead man plate, you are uncatchable. The Sadism is amplified by the Runic Armor, Windspeaker's Blessing mastery skill and Spirit Visage.

So How do you level your skills? what do you max out first? What do you start with first?

Well to start of the game Get your Q first. This is your main source of poke and trade damage which is very useful early on when you need to win your lane. This is also a source of health regen when you land your Cleaver on your target and if you can get a kill its even greater then what you had spent to cast it. The Damage is not so good at lv 1 but its enough to make trading effective with you and your ADCs damage output compared to most enemy laners. When you get this skill to lv 2 the damage is much stronger and way more effective to trade and deal range poke damage.

Take your E second. This is for trading when you need to bodyblock your ADC and take the damage off of them and deal some additional damage to the enemy wether its the ADC or Support.

At lv 3 Get your 2nd point into your Q for the extra poke damage for safe trades. the damage really adds up since this skill has a decently low cooldown time it stacks up very quick.

At lv 4 get your W. this will allow you to body block and move in for kills. Keep in mind you do burn your HP very fast at lv 4 so use this ONLY when your going in for a kill and your close enough to Auto Attack with your E

At lv 5 3rd point into your Q, the Damage starts to be significant and often makes trading go in your favor. Most Non Sustain bot lanes cannot handle the trades and damage at this point and will request a gank so its at this point you either go for a kill or back off and play passively.

At 6 your R. Its at this point when you are the lane bully. you can spam your cleaver and not have to worry about trades because you can at any point use this skill and run away and regen your health.

From here on out Max your Q when you can, then your E followed by your W and of course getting your R points at 11 and 16.

For Spells its straightforward:
- Exhaust: Greet spell to destroy his Damage and Movement Speed to kill him but not worry about
- Ghost: make you most faster with like a TANK
- Flash: Familiar spell with everyone, from Newbies to Players. Tt move you on short distance but cam make surprise for the enemies.
Teleport: Not a bad spell due to the fact you can get back to lane quicker if need be or get to another lane to push an objective (Faster charging lane), its not commonly taken by a support but it can be useful once you get stronger and get built up and can carry your team which is an often occurence.

So as a support, this really isn't an important topic to cover however we still should for the sake of late game when you may need to defend or push waves back or in (ADC not here or you're helping him :___ with Spoils of War )

Last hitting is pretty easy with Mundo. Just use your E to buff your auto attacks, also you can use your Q to last hit since it doesn't make alot of base damage, getting minions is pretty easy with mundo. If there is a group use your W and burn them down just beware of your HP and make sure to use your cleaver to regen your HP.

As far as team work there isn't alot to discuss but there are some things to cover.

Trading Safely. Any time you go to poke and deal damage with your Cleaver make sure your target isnt paying you much attention or is going after a minion to get their Farm. The Damage is good and easy to get and safe to try to attempt it this way just be careful of your positioning when you do so you dont get poked back by the ADC or Support in laning phase or the Assassins in late team fight play.

Body Blocking. As a ank and a support it is your job to help your ADC wether its by keeping them alive or securing kills and winning lane. IF an enemy is goind in on your ADC Or teamates throw yourself in the way and absorb the Damage. This reduces the the chances of them getting a kill greatly and keeps your ADC in a position to trade back and help fight back.

Damage Peeling. This is similar to body blocking but by being a threat and making it hard to engage your ADC and Assassins you can make it easier for them to get into position for kills and picks and you can force the enemy into doing something foolish and get them caught out in a bad place.

So in essence Dr.Mundo is a very Fun Champ to play in a support role. For one very few use him as a support and even more importantly nowadays hes not a strong pick so people often underestimate him and his abilities or don't even know what he is capable of. Most people overlook him and go in to the fight thinking they won and being overconfident and it makes them get selfish and make mistakes that cost them. I hope you guys enjoy Mundo as support and i will update this guide whenever i can. Also Thanks if you got this far and thanks to the ADCs who cooperated well in my games and lead us to the WOOD V!

Also thank to theORIGINgamer. He not help me, but sorry, this i posted have little copy from your! Sorry again!