Game patch 26.20Data Dragon 16.20.1
Reference patch 16.20.1
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.
Unestablished routeRanked FlexThese patches track recommendation review, build validation and item lookup separately. Updating item data does not complete a build review.
Unreviewed route
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.
A different lane's items are not relabelled as correct. Role income, map access and starting rules can change the whole purchase order.
Champion guide MidRunes and summoner spells
A spell-casting Bot route needs mana and repeated ability contact rather than a marksman attack-speed page. Heal supports the shared lane.
Sorcery
Arcane Comet
Manaflow Band
Transcendence
Scorch
Precision
Presence of Mind
Cut Down
Flash
HealAvoid duplicating the same defensive spell without a reason. Barrier protects the user; Heal can protect both nearby lane partners.
Choose Cleanse only when removable crowd control is the lane or fight problem and you can use it reliably.
Static alternatives
These choices are not selected from live scores. Use one only after you identify the stated match problem yourself.
Oblivion Orb supplies healing reduction without committing to a completed Morellonomicon. Skip both when healing is not the problem or an ally already covers your target reliably. Healing reduction does not reduce shields.
Conditional component, not a core item. Complete Morellonomicon only when its stats and slot efficiency justify delaying another purchase.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.
Adapt the plan
Judge the whole lane or map state, not only personal kills. Choose the situation closest to the current game.
Pressure farm with your Support while keeping the wave and river warded; two opponents can still punish an isolated carry.
Move after the wave is secured and attack the objective from a position your team can defend.
Deal damage to the closest safe target and preserve the shutdown. The lead matters only while you remain alive.
Match the opposing carry's income and trade when both lane partners can participate.
Finish the wave before rotating unless the fight is immediate and clearly reachable.
Stand behind allied control and build damage on reachable targets before stepping toward the back line.
Farm near tower or with nearby allies. Give up isolated minions instead of offering another kill.
Avoid being first into river and trade an unsafe objective for income when the team cannot contest.
Wait for enemy cooldowns and attack whoever enters your safe range; survival creates more damage than a desperate flank.
Pings, movement and objectives
Protect income and coordinate with Support. Your movement should follow the wave, while your pings make target choice and danger clear before the fight begins.
Pings create a shared plan; they do not replace checking waves, vision and who can move.
Finish safe farm and communicate the recall or move before the objective setup begins.
Walk with Support or another ally and choose the side where enemy engage cannot reach you first.
Keep an exit route and identify the nearest target you can damage without crossing enemy control.
Continue useful damage without chasing away from the objective or donating a shutdown.
Later objectives: Repeat the same process around later major objectives: handle nearby income, communicate the route, enter through vision and agree on the fight before committing.
Use the guide
Compare a specific opponent, return to the champion overview, or choose another champion without losing the queue distinction.