Evasion

Evasion is a passive ability that gives the unit a chance to dodge an incoming physical attack. However, True Strike granted by Monkey King Bar completely negates all evasion effects, except against towers.

Multiple sources of evasion stack, as well as other sources of miss chance such as blind effects and the uphill miss chance. While the actual chance to evade is diminishing, each source of evasion increases your effective HP against physical attacks more than the last due to evasion's exponential nature. Note that evasion does not use pseudo-random distribution.

Faceless Void's is unique in that it is not considered Evasion, but rather damage negation, since it only nullifies the damage of attacks or spells, but not their secondary effects.

Evasion stacks multiplicatively, so we have:

Total chance to get hit = (first chance to get hit) x (second chance to get hit) x (nth chance to get hit) x 100, where chance to get hit = 1 - evasion

I.e. for Butterfly the chance to get hit is 65% because Butterfly has 35% evasion. The source of evasion values must be expressed in hundredths (so if we have 50% evasion, the value needs to be 50/100 = 0.5).

As an example, if Phantom Assassin has Level 4 Blur (0.5 chance to get hit) and Butterfly (0.65 chance to get hit), her chance to get hit by attacks is 0.5 * 0.65 = 0.325 or 32.5%. A more concrete way of thinking about evasion stacking is that for an attack to bypass an evasion stack and connect, it should bypass each source of evasion in sequence. Only if all sources of evasion fail, is the attack able to deal damage.

Sources of Evasion

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True Strike
True Stike is an attack modifier that prevents the affected unit's attacks from missing, negating evasion, blindness and the 25% uphill miss chance for ranged units. Though, projectiles of a ranged unit with True Strike can still be disjointed. True Strike does not work when attacking buildings. However, it works against any other unit, including wards and allied units.

Sources of True Strike

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