Attacker accuracy is compared to defender evasion to work out the chance to hit. If the attacker is blinded, this chance is 50% lower.
The chance to evade is inherently the inverse of this (chance to evade = 1 – chance to hit).
If the hit was not evaded and the defender has a chance to dodge, this is tested (dodge chance is completely random).
I don’t understand what this means, exactly. But Dodge is entirely separate from evasion and does not interact with it, or the entropy value. If a hit is not evaded, dodge chance is tested to see if it is dodged. If a hit is evaded, dodge chance is not checked because there would be no point.
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Each entity in the world contains an ‘evasion entropy’ value, between 1 and 100. The higher this value is, the more likely they are to be hit by the next attack. The initial value is random.
Every time something attacks you, they calculate their chance to hit as a percentage. That value is added to your evasion entropy. If the result exceeds 100, you’re hit, and 100 is subtracted from the value. If the value hasn’t reached 100, you’re not hit.
Before anyone starts clamouring that they’re not getting their actual chance to hit/evade, let’s examine this mechanic in a bit more detail. Take the simple example of 100% chance to hit. Since you always add 100 to the entropy, it’ll always exceed 100, and thus always hit, which is correct. The case of 0% chance to hit can similarly be trivially shown to be correct.
So let’s look at 50% chance to hit. Since the initial value is random from 1-100, there’s a 50% chance that the initial entropy value is higher than 50%, in which case adding the 50 from chance to hit will exceed 100 and thus hit, and a 50% chance the value is 50% or less, in which case adding 50 will not exceed 100, and thus not hit. So the first hit has a 50% chance to hit, as it should.
The second hit also has a 50% chance to hit, but will never hit if the first one does – provided you’re only getting hit by things with 50% chance to hit you, you’ll evade every second attack, and be hit by the others.
Let’s say the initial entropy was 42. The first hit increases this to 92, and misses. The second raises it to 142, hitting, and then subtracts 100 from the value, leaving it back at 42.
I’ll leave other percentages as an exercise for the reader, but they all work out – if an attack has 25% chance to hit you, every fourth attack will hit, and so on.
This is the mechanic by which streakiness is removed from evasion – it removes the possibility of failing to evade happening to come up several times in a row due to bad luck. Each attack has the correct chance to hit, and will hit you just as often as you’d expect in the average case using a purely random system, but the possibility of occasional but devastating non-average results – such as being hit by four consecutive attacks with only 10% chance to hit each – have been eliminated.
1) If an attack would crit you, evasion is tested a second time, and if you evade, the hit is downgraded to a non-crit (it does not miss, since it’s already tested for that and hit). This roll is purely random and does not increase the entropy value – it just generates a number from 1 to 100 and compares to the chance to hit. Details of why are in the spoiler.