AD vs AP in League of Legends: Damage Types, Armor, and Magic Resist Explained
AD deals physical damage stopped by armor, AP deals magic damage stopped by magic resist, and true damage ignores both — here's how it shapes every build.
If you've ever opened a build guide, seen someone stack armor against one enemy and magic resist against another, and wondered why, this is the piece of League of Legends that ties it all together. AD vs AP in League of Legends isn't just two letters on an item icon; it's the whole logic behind who you kill, what you buy, and what stops you cold. Get the damage-type triangle straight and about half of the shop stops feeling random.
Damage types in LoL, explained: physical, magic, and true
Every point of damage in League is one of three flavors, and the game quietly tells you which by color when it pops off an enemy's health bar. Physical damage shows up orange or white. Magic damage is teal. True damage is a clean bright white that nothing softens. Auto-attacks are always physical unless a champion's kit converts them. Abilities can be any type — the champion decides, not the item you bought. That last part trips up new players constantly: slapping ability power onto an auto-attack carry doesn't magically turn their hits into magic damage.
Here's the distinction worth burning into memory. AD and AP describe what you build; physical, magic, and true describe what you deal. They usually line up — an AD champion tends to deal physical, an AP champion tends to deal magic — but not always. Champions like Kai'Sa and Kayle blur the line, dealing mixed or converted damage, which is exactly why the color of the number matters more than the letter on your items. Read the tooltip, watch the color, and you'll never guess wrong.
- Damage rides on auto-attacks and physical abilities, so attack speed, crit, and lethality all earn their gold.
- Tends to ramp — weak in the first few minutes, terrifying once the core items come online.
- Shut down by armor and raw health, which is why one well-timed defensive buy can erase your output.
- Damage comes from abilities and usually lands in bursts rather than a steady stream.
- Often spikes hard on a single item, so one big purchase can flip a fight instantly.
- Shut down by magic resist and by champions who dive you before your cooldowns come back.
VerdictNeither path is 'better.' The right one is whichever your champion's kit actually scales with — building AP on a champion with no magic ratios is just a worse version of the item they really wanted.
Armor vs magic resist: the two shields
Armor and magic resist are mirror images. Armor cuts incoming physical damage; magic resist cuts incoming magic damage. Both follow the same math — each point gives a little less raw survivability than the last, but because your health and your resist multiply together, stacking them is more efficient than it looks on the tooltip. The practical takeaway: if the enemy team is landing four physical threats on you and one mage, you build armor first and worry about magic resist later. You itemize against what's actually killing you, not against a checklist.
| If your damage is... | It's reduced by... | So the enemy answers with... |
|---|---|---|
| Physical | Armor | Stacking armor + health |
| Magic | Magic resist | Stacking magic resist + health |
| True | Nothing | Range and positioning, not stats |
How the damage triangle decides your shopping
This is where theory turns into gold spent well. The moment you know your own damage type and the enemy's, the shop stops being a wall of icons and becomes a set of answers. Doing physical damage into a team that keeps buying armor? You reach for armor penetration or lethality so your hits punch through. Playing a crit marksman? Infinity Edge amplifies the crits your entire build is designed to land, which is why it's a cornerstone rather than a luxury. Stacking a burst mage like Veigar? Rabadon's Deathcap multiplies every point of ability power you already own, so it gets stronger the more AP you've bought — grab it too early on an empty inventory and you waste half its value.
- Read the death recap. Which color killed you? That's the resist to buy next.
- Check the enemy's items. If they've started armor, your physical carry needs penetration, not more raw AD.
- Match amplifiers to your own build — Infinity Edge belongs on crit builds; Rabadon's Deathcap belongs on champions already deep into ability power.
- Against sustained damage, buy resist and health together; one without the other leaves you fragile.
- Against burst, prioritize the specific resist plus a chunk of raw health so a single combo can't delete you.
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Guide FAQ
What is true damage in League of Legends?
True damage is damage that ignores both armor and magic resist — the enemy takes the full amount no matter how tanky they build. It usually appears on execute abilities, some ultimates, and passives like Vayne's third-hit bolts. Because no defensive stat reduces it, you counter true damage by not getting hit: outrange it, dodge it, or kill the source before it ramps up.
Is armor or magic resist better?
Neither is better in a vacuum — it depends entirely on who's hitting you. Buy armor when the threats are physical (most marksmen, many bruisers and assassins) and magic resist when the threats are magic (most mages). If you're dying and you're not sure which, glance at the color of the damage in your death recap and buy the resist that matches it.
Should I build AD or AP on my champion?
Build whatever your champion's abilities scale with — the champion decides that, not you. A champion with strong AD ratios wants attack damage and items like Infinity Edge; one with strong magic ratios wants ability power and Rabadon's Deathcap. Putting the wrong stat on a champion hands you a weaker version of the item they actually needed, so check your ability tooltips or a trusted build if you're unsure which ratios carry your damage.
Does armor reduce true damage?
No. Armor only reduces physical damage, and magic resist only reduces magic damage. True damage bypasses both, which is the entire point of it. Buying more armor against a true-damage threat like a fed Vayne does almost nothing, so spend that gold on health, range, or an item that lets you kill her first.
How do I know if a champion deals physical or magic damage?
Watch the color of the damage numbers — physical is orange or white, magic is teal, and true is bright white. You can also read the ability tooltips, which state the damage type outright. As a rough rule, auto-attack carries deal physical and spellcasters deal magic, but always confirm, because hybrid champions like Kai'Sa cheerfully break that pattern.
Is it worth building both armor and magic resist?
Only when the enemy threat is genuinely split. If four of their five damage sources are physical, stacking magic resist wastes gold that should have gone into armor and health. Mixed resistances make sense on tanks facing balanced teams, but for most players the real mistake is spreading too thin — commit to the resist that answers your biggest threat first, then round out afterward.