Wiki
How the game works under the hood: classes, skills, combat, gear and monsters.
Basics
Combat
Damage Formula
How ATK, Crit, Penetration and Hit turn into damage, and how enemy stats reduce it.
Auto-cast and Global Cooldown
Which skill your hero casts next on auto, and why lower skills fire less often than their cooldown suggests.
Threat and Taunt
How monsters choose who to attack, why Warriors hold aggro, and which pets can taunt.