Damage block

Damage Block is a mechanic that reduces physical attack damage a unit takes by a flat amount. Most damage block abilities are chance-based and passive.

Mechanics
Damage block reduces any physical damage a unit takes from attacks or from cleave, with the exception of damage dealt by the attacks of ward-type units. Damage block does not trigger against physical spell damage, with the exception of the spells listed below. Unlike armor, damage block reduces a fixed amount of damage, instead of a percentage.

When damage block triggers, it blocks damage before other damage reducing effects do. This means that the higher the unit's armor is, the less effective damage block gets. See final attack damage for the complete calculation.

All chance-based sources of damage block use pseudo-random distribution.

Blocked Spell Damage
The following abilities' damage is blocked by Damage Block.

1Only returned/reflected physical damage is blocked. Magical and pure damage is not blocked.

Visual Feedback
When a damage block occurs, a ocher-colored negative number pops up on the unit, with a shield icon on the right side of the  number. This number shows the exact amount of damage blocked.

Stacking
The proc chances of all sources of Damage Block work independently from each other.


 * When having a single source of Damage Block from multiples of the same item, the chance for Damage Block stacks multiplicatively.
 * When having multiple sources of Damage Block, the one with higher proc chance or Damage Block values gets prioritized, while the other sources do nothing.

This results in a diminishing stacking behavior, and it can be defined as



With  being the Proc Chance of Damage Block.

Examples

 * Example 1
 * When having two, what is the chance for Damage Block to proc?




 * Therefore, when having two, the chance for Damage Block to proc becomes %.


 * Example 2
 * is affected by and he has one  in his inventory. What are the chances for both sources of Damage Block that Warlock currently have to proc?


 * Damage Block Proc Chance for both sources:
 * from Crimson Guard -


 * Since Vanguard has a lower proc chance, therefore Vanguard's Damage Block proc chance is multiplied with the higher proc chance of, resulting in %. So now, there is for 's Damage Block to proc, and a % proc chance for Vanguard.


 * This means that half of the time 's Damage Block will proc at the same time as does, but since  has the higher block values, it gets prioritized, effectively negating half of the Vanguard's procs.