What is Pseudo-random distribution?
Pseudo-random distribution (PRD) is a mechanic that regulates the probability of certain effects being triggered by abilities and items in a game. Unlike true random distribution, where each “coin flip” is independent, PRD increases the probability of an effect being activated with each unsuccessful attempt. This makes effects trigger more consistently and predictably, making the game less dependent on luck. PRS is most commonly used for the following types of effects: Critical Strike, Stun, Evasion, Chain Lightning (Maelstrom/Mjollnir), Greater Bash (Spirit Breaker), etc.
Example: on melee heroes, Skull Basher's Bash has a 25% chance to stun the target. On the first attack, however, it only has an ~8.5% probability to bash. Each subsequent attack without a bash increases the probability by ~8.5%. So on the second attack, the chance is ~17%, on the third it is ~25.5%, etc. After a bash occurs, the probability resets to ~8.5% for the next attack. These probabilities average out so that, over a moderate period of time, Bash effect procs nearly 25% of the time.
