Damage Block

Damage Block is a mechanic that reduces incoming damage, typically by a flat amount.

Overview
Damage block differs from Damage Manipulation in that it always reduces instead of increasing incoming damage, and is able to block damage with the HP Removal flag.

There exist four different categories of damage block currently, which are listed by the order of proccing below.

Mana Shield Damage Block
Driven by MODIFIER_PROPERTY_TOTAL_CONSTANT_BLOCK_UNAVOIDABLE_PRE_ARMOR.

blocks damage of all types, before all other damage manipulation. The block value is variable and adapts to the damage value of the incoming instance.

Physical Damage Block


Driven by MODIFIER_PROPERTY_PHYSICAL_CONSTANT_BLOCK.

Physical damage block reduces any physical damage a unit takes from attacks or from cleave, with the exception of damage dealt by attacks from ward-type units. Physical damage block offers no protection against spells, with only a few exceptions.

Physical damage block triggers after, but before all other damage manipulation. This means that the higher the unit's armor is, the less actual reduction is provided by damage block. However, the effectiveness of damage block is only meaningful in relation to the attacker's damage. See total attack damage for detailed examples with calculation.

When physical damage block procs, an 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.

Chanced-based physical damage block uses pseudo-random distribution.

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

Not Blocked Attack Damage
Attack damage setting is not blocked by Damage Block.

Magical Damage Block
Driven by MODIFIER_PROPERTY_MAGICAL_CONSTANT_BLOCK.

Magical damage block reduces any magical damage a unit takes from attacks or from spells.

Magical damage block triggers after, but before all other damage manipulation. This means that the higher the unit's magic resistance is, the less actual reduction is provided by damage block.

When magical damage block procs, a cyan-colored number pops up on the unit, showing the exact amount of damage blocked.

 

Universal Damage Block
Driven by MODIFIER_PROPERTY_TOTAL_CONSTANT_BLOCK.

Universal damage block reduces damage of all three types a unit takes. It triggers after almost every other source of damage manipulation. Therefore, on-damage effect will proc directly afterwards.

Stacking
Within the same damage block category, if multiple sources of damage block activate, the actual blocked damage is taken from the source with the highest block value, and the other sources cannot reduce damage any further. Sources from different categories simply block the damage sequentially, independent of each other. Thus, it is inadvisable to stack multiple damage block sources of the same category.

Side Effects
Many sources of damage block have negative side effects that can take place when blocking damage. When multiple sources of the same category activate at once, even though only the source with the highest block value actually reduces damage, the side effects will all activate regardless.

For example, and  will both go on cooldown from one single magical damage instance, and a single attack can remove a stack from both, , while simultaneously causing   rum hangover.

Thus, it could be inadvisable to try and stack multiple damage block sources of the same category.

Chance-based blocking
The proc chances of physical damage block work independently from each other. The probability of proccing any damage block when there are multiple damage block sources of the same value can be defined as

% Block = 1 - $$\prod_{i=1}^{n}$$(1 - Damage Block Sources i )

Examples

 * Example 1
 * has two in his inventory. What is the probability that one of them will proc when he is attacked?


 * Block Chance
 * = 1 - (1 - ) × (1 - )
 * = 1 -


 * As has a Damage Block proc chance of, the probability of Damage Block proccing when he is attacked is %.


 * Example 2
 * is affected by and he has one  in his inventory. What is the probability for each source of Damage Block to proc?


 * The Proc Chance and Damage Block for both sources are:
 * from Crimson Guard: chance,  damage blocked
 * : chance,  damage blocked on a ranged hero like


 * As procs on every hit, and its blocked damage value is greater than that of ,
 * will have no effect on damage blocked whether it procs or not.

Recent Changes
Bloqueio de dano Блокировка урона 伤害格挡