How Combat Works in TFT: Mana, Damage Types, Armor, and Attack Speed

Every TFT round comes down to a few seconds of automated chaos, and if you've ever wondered how does combat work in TFT under the hood, the answer lives in four numbers on the unit sheet: mana, damage, armor, and attack speed. Understanding those numbers is the gap between guessing at items and knowing exactly why your carry melts the enemy board or whiffs into a wall. This guide decodes the stat sheet — TFT mana explained, the three TFT damage types, and how the TFT armor magic resist system actually mitigates a hit.

TFT Mana Explained: What Fuels an Ability Cast

Think of mana as a cast timer you're allowed to speed up. Most units start a round with a chunk already banked, then gain a flat amount — usually around 10 — every time they land an auto-attack, plus a smaller trickle when they take damage. When the bar hits its cap, the unit casts, the bar empties, and the cycle restarts. That's why a backline sorcerer who never gets touched still spits out spells: attacking alone keeps the meter climbing.

This is also why mana items are so violently good on the right carry. A Blue Buff shrinks the effective gap to the next cast and refunds mana the moment a unit casts, so a cheap caster can chain abilities almost back-to-back. Spear of Shojin works the other end, handing out bonus mana on every attack so an attack-based caster spools up faster the longer a fight drags on. Slap either onto the unit that is the entire reason your comp exists, and you'll watch it go from one cast a fight to three or four.

TFT Damage Types: Physical, Magic, and True

Every point of damage is one of three types, and the type decides which defense — if any — gets to reduce it. Physical damage, usually shown as attack damage or AD, covers auto-attacks and abilities that scale off a unit's AD, and it's blocked by armor. Stack a couple of Deathblade and your marksman's autos and its AD-scaling ability hit harder, though a heavily armored frontline still eats a big share of it.

Magic damage comes from ability power, or AP, and it's reduced by magic resist rather than armor. Casters live here, and Rabadon's Deathcap is the signature item: it multiplies a unit's AP, which in turn inflates every AP ratio on its ability, so one spell can leap from a nuisance to a one-shot. True damage is the honest one — it ignores armor and magic resist entirely. Four hundred true damage is 400 to a naked support and a 300-armor titan alike, which is exactly why the game hands it out so sparingly.

TFT Armor and Magic Resist: How Mitigation Really Scales

Here's the part most players get wrong. Armor and magic resist don't shave off a flat percentage per point, and they never hard-cap. They obey one clean formula: the fraction of damage you block equals your resist divided by (100 plus your resist). Run the numbers and something useful falls out — 100 armor blocks half of incoming physical damage, 200 blocks about two-thirds, and 300 blocks three-quarters.

Notice that each slab of armor buys a little less percentage than the one before it. People take that to mean stacking defense stops paying off — it doesn't. Every point of resist is now guarding a bigger and bigger effective health pool, so more armor still translates into real survivability. What changes isn't whether defense works; it's what beats it.

Cutting Through Defenses: Shred and Percent-HP Damage

Because defenses scale, the counter is to ignore or erase them. Two tools do the job. The first is penetration and shred — stripping the target's resist so the formula tilts back your way. Last Whisper is the classic: land a hit and it tears a chunk of armor off the enemy for a few seconds. Against a 300-armor tank that's enormous, because you're peeling away the most valuable end of the curve, not the cheap end.

The second tool sidesteps defense entirely by scaling off the target's health instead of your damage. Giant Slayer adds damage based on the enemy's maximum HP, so the fatter the target, the harder it lands. Against a squishy backliner it does little; against a giant tank it does exactly what the name promises. Stack a shred item and a percent-HP item on the same carry and you've built a dedicated tank-buster.

• Enemy stacking armor? Bring physical shred, or swap your win condition to a magic-damage carry they can't armor against.
• Enemy stacking magic resist? Do the reverse — lean on AD or a true-damage source.
• Enemy running one giant tank? Percent-max-HP damage like Giant Slayer turns their health total into a liability.
• Enemy spread thin with no real frontline? Flat burst and true damage clean up faster than percent-HP tools ever will.

Why Attack Speed Does Two Jobs

Attack speed looks like a simple damage stat, and it is — but it's quietly a mana stat too. Every auto-attack generates mana, so doubling a unit's attack speed doesn't only double its auto damage; it also roughly doubles how quickly it reaches the next cast. For an attack-based caster the effect compounds: more attacks, more casts, more of both. That's often the single strongest multiplier you can hand such a carry.

There's a ceiling worth respecting. Attack speed runs into a soft cap, so the tenth source of it matters far less than the first. Once a carry is already casting every couple of seconds, raw AD or a survivability item usually does more than piling on yet more speed.