Dr. Mundo in League of Legends is a health-cost champion. He pays health to cast spells, then gets value back through regeneration, refunds, and smart timing. If you understand the exact rules on his passive, his refunds, and his grey health, you make better trades and avoid wasted casts.

This article covers Dr. Mundo’s abilities using the mechanics and notes provided, with a focus on what each spell does, what it costs, and the interactions that change outcomes.

How Dr. Mundo’s kit is built

Mundo’s kit has a clear pattern: spend health to act, then recover health through regeneration and ability rules. That makes his timing and positioning important. It also means small details matter, like when a spell shield blocks an effect, or when a refund still happens.

You do not need complex combos to use him well. You need clean execution: land Q, time W detonation, and manage your passive canister.

Passive: Goes Where He Pleases

What the passive gives at all times

Goes Where He Pleases has an innate regeneration bonus. Mundo regenerates an additional 0.4% to 2.3% of his maximum health every 5 seconds, scaling by level. The passive has a static cooldown that scales from 60 down to 15 seconds based on level.

The cooldown resets when Mundo respawns.

The immobilize immunity and canister

Periodically, Mundo gains immunity to the next hostile immobilizing effect that would affect him. When he resists one, he pays a health cost equal to 4% of his current health.

After resisting, he launches a canister that lands 525 units in the general direction of the source. The canister stays on the ground for 7 seconds.

Picking up the canister (and what enemies can do)

If Mundo moves near the canister, he consumes it. This heals him for 4% of his maximum health and reduces the passive cooldown by 15 seconds.

Enemy champions can move near it to destroy it. If they destroy it, Mundo does not get the heal or cooldown reduction.

Important passive interaction rules

Some interactions change how safe Mundo feels against crowd control.

Goes Where He Pleases also grants immunity to additional immobilizing effects from the same cast instance once it triggers. This matters against abilities that apply multiple immobilizes as part of one cast.

If an ability has damage or non-immobilizing effects nested inside an immobilize, the passive prevents those nested parts too. If the damage or effects apply separately, the passive usually does not prevent them.

Spell shields have priority in key cases. Sivir’s Spell Shield and Black Shield take priority over Goes Where He Pleases.

The passive does not trigger against Rell’s Magnet Storm ongoing kinematic effect. It can trigger against and prevent the initial airborne displacement, but it does not prevent the continuous effect.

The canister transitions with Mundo into and out of Mordekaiser’s Realm of Death. The canister cannot be interacted with while Mundo is untargetable.

Q: Infected Bonesaw

Core function

Infected Bonesaw throws a bonesaw in the target direction. It hits the first enemy struck, dealing magic damage and applying a slow.

It slows by 40% for 2 seconds.

Exact costs and timing

• Cost: 50 / 60 / 70 / 80 / 90 health
• Cooldown: 4 seconds
• Cast time: 0.25 seconds
• Target range: 1050 (center) / 990 (model)
• Width: 120
• Speed: 2000

This cast fires from where Mundo stands at the start of the cast time.

Damage rules and caps

The damage is a percent of the target’s current health:

• Magic damage: 20 / 22.5 / 25 / 27.5 / 30% of the target’s current health

It has a minimum damage threshold:

• Minimum damage: 80 / 130 / 180 / 230 / 280

It also has a monster damage cap:

• Capped monster damage: 350 / 425 / 500 / 575 / 650

Refund and spell shield note

If the bonesaw hits an enemy, Mundo heals for 50% of the health cost. This refund increases to 100% when he hits a champion or a monster.

A spell shield that blocks the ability’s effects on the enemy does not prevent Mundo from receiving the health cost refund. That means the refund rule ties to the hit outcome in this specific way, even when the target blocks effects.

W: Heart Zapper

Channel phase: damage ticks and grey health storage

Heart Zapper is a charge-up that can last up to 3 seconds. While active, it deals magic damage every 0.25 seconds to nearby enemies and stores a portion of post-mitigation damage Mundo takes as grey health.

• Cost: 8% of current health
• Cooldown: 17 / 16.5 / 16 / 15.5 / 15
• Cast time: none
• Effect radius: 325

Magic damage per tick:

• 5 / 8.75 / 12.5 / 16.25 / 20 per tick

Grey health storage:

• Stores 80% to 95% (based on level) of post-mitigation damage taken as grey health
• After the first 0.75 seconds, this is reduced to 25%

Detonation phase: damage and healing

Heart Zapper can be recast after 0.5 seconds, and it also recasts automatically when the duration ends. The recast detonates the defibrillator.

Detonation magic damage:

• 20 / 35 / 50 / 65 / 80 (+ 7% bonus health)

Detonation healing:

• Heals for 50% of grey health
• Heals for 100% of grey health if the detonation hits at least one enemy champion or a large monster

Spell shield and buffering notes

Spell shield interaction is specific: Sivir’s Spell Shield only blocks the detonation, not the charge-up ticks.

Heart Zapper sometimes deals an additional tick of damage (noted as a bug).

Heart Zapper and its recast can buffer and cast at the end of Infected Bonesaw’s cast time if attempted during Q’s cast time. Another input, like a movement command, can override that buffering.

E: Blunt Force Trauma

Passive bonus attack damage

Blunt Force Trauma gives bonus attack damage based on maximum health.

• Bonus attack damage: 2 / 2.25 / 2.5 / 2.75 / 3% of maximum health

Active empowerment: rules, scaling, and knockback

The active empowers Mundo’s next basic attack within 4 seconds. It has an uncancellable windup, gains 50 bonus range, and deals bonus physical damage that increases based on missing health.

• Cost: 10 / 25 / 40 / 55 / 70 health
• Cooldown: 9 / 8.25 / 7.5 / 6.75 / 6
• Cast time: none
• Range: 800

Minimum bonus physical damage:

• 5 / 15 / 25 / 35 / 45 (+ 7% bonus health)

The bonus damage increases by 0% to 40% based on Mundo’s missing health.

If the target dies or is a small monster, Mundo knocks the body away in a line (not through terrain). Enemies the body passes through take 100% AD plus the minimum bonus damage.

Damage multipliers and basic rules

The empowered hit and the triggering attack’s damage get extra multipliers against minions and monsters:

• 140% damage against minions
• 200% damage against monsters

Blunt Force Trauma resets Mundo’s basic attack timer.

Interaction rules that affect outcomes

The empowered attack works against structures. It consumes the buff and deals its full damage.

Blunt Force Trauma cannot knock back wards, structures, or epic monsters it kills. It also cannot knock back champions that enter a zombie state upon dying.

Targets flung away become untargetable during the fling.

The damage from the corpse colliding with enemies does not benefit from the empowered attack critically striking.

Spell shields do not block this in the same way as many spells. Parries and specific blocks can matter, including Shen’s Spirit’s Refuge blocking.

R: Maximum Dosage

What the ultimate grants

Maximum Dosage enhances Mundo for 10 seconds, giving increased base health, bonus movement speed, and bonus health regeneration.

• Cooldown: 120
• Cast time: none

Increased base health:

• 15 / 20 / 25% of missing health

Bonus movement speed:

• 15 / 25 / 35%

Bonus health regeneration:

• 20 / 40 / 60% of maximum health

Rank 3 enemy proximity scaling

At rank 3, Maximum Dosage gains extra power based on nearby enemy champions at cast time. The increased base health and the bonus health regeneration are both increased by 5% for each enemy champion within 1200 units when cast.

Dynamic regen and early ending condition

The health regeneration granted adjusts dynamically to Mundo’s maximum health.

Maximum Dosage ends early if Mundo enters resurrection.

Practical ability flow

• Use Infected Bonesaw (Q) to apply a 40% slow for 2 seconds and to trigger the health cost refund on a hit.
• Use Heart Zapper (W) when you expect to take damage, then detonate after 0.5 seconds or later to convert grey health back into healing.
• Use Blunt Force Trauma (E) when you can secure a hit within 4 seconds, especially when missing health is high for the bonus damage scaling.
• Track Goes Where He Pleases cooldown and fight near the canister path so you can pick it up for the 4% max health heal and 15-second cooldown reduction.
• Use Maximum Dosage (R) before a fight that will last, since it runs 10 seconds and gives movement speed plus strong regeneration tied to max health.

Common mistakes that waste value

Triggering passive and losing the canister

If the canister lands in a spot you cannot reach, you lose the 4% max health heal and the 15-second cooldown reduction. When you expect incoming immobilize, angle your position so the canister lands where you can walk to it.

Enemies can destroy the canister by moving near it. Plan for that. Step toward it quickly when it is safe.

Detonating W with no target

Heart Zapper heals 100% of grey health only if the detonation hits an enemy champion or a large monster. If you detonate with nothing in range, you cut your healing in half.

The radius is 325. Be close enough before you detonate.

Casting Q without respecting cast time

Infected Bonesaw casts from Mundo’s position at the start of its cast time. If you start the cast, then your target shifts, the throw still follows the original cast context.

That matters in tight trades. Cast when your aim line is stable.

A clean takeaway for consistent results

Dr. Mundo in League of Legends rewards players who respect his numbers. His passive canister rules decide if you stay in a fight or fall out of it. His Q refund keeps his health costs under control, but only when it connects. His W turns damage into healing, but only if the detonation hits the right target. Put those rules first, and the rest of the kit starts to feel simple.

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