Game patch 26.20Data Dragon 16.20.1
Reference patch 16.20.1
the Revered Inventor
Heimerdinger is a spell-focused champion who plays around range, cooldowns and controlled areas. This overview keeps the explanation practical and leaves patch-sensitive numbers to Riot's structured data and the current in-game tooltip.
Usual roleMidStrengths and limits
These are kit-level patterns, not a promise that every lane or matchup plays the same way.
Turret placement can be a deciding factor in a battle. Against most enemies turrets are best when they can support each other, but if the enemy has a lot of area of effect damage your turrets can be destroyed quickly. Placing turrets in brush can lead to a surprise attack in your favor.
The success of Electron Storm Grenade is very important to Heimerdinger's survival. The slow and stun both are capable of keeping enemies in place long enough to punish them, but it is also the first line of defense against a surprise attack.
Spreading out Hextech Micro-Rockets leads to more reliable damage and more efficiency against multiple targets, but focusing it creates the biggest impact.
It's better to destroy all of Heimerdinger's turrets at once with the help of creeps than to fight them one at a time.
Be wary of Heimerdinger's Upgrade!!!, as he can use it to find an answer to most trouble he gets into. Once his ultimate is down, go in for the kill!
Practical champion reading
Use these patterns to ask better questions before choosing an item, target or commitment. They describe the kit, not a guaranteed result.
Magic resistance can reduce the broad spell profile, but positioning and cooldown tracking still decide whether the important abilities connect.
Do not judge the champion from one button. Watch which setup, payoff and escape tools are available before choosing a trade or commitment.
Ranged attacks are useful only while a safe line to the target remains. Flanks, hard control and blocked escape routes can remove that advantage quickly.
Protection, setup and information can matter more than personal damage. Position so the next useful spell can reach the ally or target that needs it.
Tenacity can shorten only eligible control. Displacements, airborne effects and repeated slows need their own positioning, blocking or movement answer.
Reserve anti-heal and anti-shielding for a visible problem in the full team composition; they are not default answers to every champion.
A spell being available does not mean the complete sequence is sustainable. Watch the resource bar as well as the setup and escape cooldowns.
Defensive item reference
Start with the threat that is actually affecting the match. These are conditional comparisons, not an automatic counter build.
Magic resistance addresses his turret and spell pressure, while Tenacity can shorten the grenade's reducible stun and slow. Plated Steelcaps do not broadly reduce ability or turret spell damage.
Use Plated Steelcaps only when physical basic attacks elsewhere in the opposing team are the larger danger.Normal Draft and Ranked role map
Each lane is assessed separately. Open a role to reach its queue-specific build and matchup preparation.
Historical reference. Recommendation review pending. Heimerdinger has a secondary role listed in this historical reference. It is less common than the primary roles, but it has a recognisable role-specific plan.
Historical reference. Recommendation review pending. Heimerdinger is normally played Mid and does not currently have a reviewed Jungle route. Jungle usually needs repeatable monster clear, safe pathing and objective control without lane income. Treat this as a deliberate experiment, not a standard recommendation.
Historical reference. Recommendation review pending. Heimerdinger has an established central-lane plan with access to waves, both sides of the river and meaningful pressure between objectives.
Historical reference. Recommendation review pending. Heimerdinger is normally played Mid and does not currently have a reviewed Bot route. Bot usually needs dependable duo-lane scaling and sustained damage with shared early pressure. Treat this as a deliberate experiment, not a standard recommendation.
Historical reference. Recommendation review pending. Heimerdinger has a secondary role listed in this historical reference. It is less common than the primary roles, but it has a recognisable role-specific plan.
Situational AP purchase
Buy healing reduction when enemy healing or regeneration is deciding fights and you can keep damaging the relevant target. Grievous Wounds reduces healing; it does not reduce shields, magic damage or crowd control.
Oblivion Orb can provide healing reduction without immediately paying for a completed Morellonomicon. Fit the component around your core damage, mana and survival needs; check the current queue's item tooltip.
Complete Morellonomicon when its stats and slot efficiency suit your build. Do not treat it as a mandatory first item just because your champion deals magic damage.
Multiple Grievous Wounds sources do not add their percentages together. Another reliable applier may cover the same target, but you may still need your own source for a separate fight or target.
Repeated spell damage and damage over time can maintain coverage more reliably than a single hit. Match the purchase to your actual spell access, enemy sustain and the teammates who can apply the debuff.
If you die before dealing damage, you apply no healing reduction. If your target dies before healing, there is little healing to prevent. The debuff applies on qualifying damage immediately; it does not need to build up. It remains briefly after your last hit, so teammates can benefit even after you disengage.
Only healing during the active debuff counts. For example, 40% reduction prevents 80 of a 200-point heal, or 400 of a 1,000-point heal, before other modifiers. Compare that with the damage, penetration or survival you delayed; neither example guarantees a kill. Healing after the debuff expires is unaffected.
See the Oblivion Orb and Morellonomicon references for current effects and queue availability. These are situational decisions, not a measured best-build claim.
Kit reference
Ability names, descriptions and numeric fields come from Riot Data Dragon. Practical reads are independently written; the current in-game tooltip remains authoritative.
What it doesGain Move Speed while near allied towers and turrets deployed by Heimerdinger.
Practical readHextech Affinity is the always-on rule shaping Heimerdinger's normal trading and fight pattern. Watch its in-game state before committing.
What it doesHeimerdinger lays down a rapid-fire cannon turret equipped with a secondary pass-through beam attack (turrets deal half damage to towers).
Practical readH-28 G Evolution Turret creates setup or area pressure. Place it where the opponent must choose between entering its space, changing route or giving up the immediate contest.
What it doesHeimerdinger fires long-range rockets that converge on his cursor.
Practical readHextech Micro-Rockets is a ranged cast involving its listed effect. Respect its line or target area, and avoid spending it when the opponent can simply step away before the important exchange.
What it doesHeimerdinger lobs a grenade at a location, dealing damage to enemy units, as well as stunning anyone directly hit and slowing surrounding units.
Practical readCH-2 Electron Storm Grenade is a ranged cast involving a slowing effect and damage. Respect its line or target area, and avoid spending it when the opponent can simply step away before the important exchange.
What it doesHeimerdinger invents an upgrade, causing his next spell to have increased effects.
Practical readUPGRADE!!! changes a following cast rather than acting as an isolated button. Choose the version needed before committing, then check the current tooltip for each upgraded effect.
Levels 1–18
Base values exclude items, runes, temporary buffs and mode-specific modifiers. Cooldowns are the listed base cooldown before ability haste.
Cooldown Data Dragon 16.20.1
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
First rank becomes available at level 6; later ranks normally become available at levels 11 and 16.
| Level | Health | Mana | Ability milestone |
|---|---|---|---|
| 1 | 558 | 385 Mana | Choose the first basic ability |
| 2 | 634 | 399 Mana | Add another basic ability or rank |
| 3 | 713 | 415 Mana | Add another basic ability or rank |
| 4 | 796 | 430 Mana | Spend one ability point |
| 5 | 882 | 447 Mana | Spend one ability point |
| 6 | 973 | 464 Mana | First ultimate rank normally available |
| 7 | 1,067 | 482 Mana | Spend one ability point |
| 8 | 1,164 | 501 Mana | Spend one ability point |
| 9 | 1,266 | 520 Mana | Spend one ability point |
| 10 | 1,371 | 540 Mana | Spend one ability point |
| 11 | 1,479 | 561 Mana | Second ultimate rank normally available |
| 12 | 1,592 | 582 Mana | Spend one ability point |
| 13 | 1,708 | 604 Mana | Spend one ability point |
| 14 | 1,827 | 627 Mana | Spend one ability point |
| 15 | 1,951 | 650 Mana | Spend one ability point |
| 16 | 2,078 | 675 Mana | Final ultimate rank normally available |
| 17 | 2,209 | 699 Mana | Spend one ability point |
| 18 | 2,343 | 725 Mana | Spend one ability point |
Choose the next question
Choose a queue-aware build, compare a lane opponent, or return to the full champion library.
