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• A default Armory comes with 10,000 slots.
• Armory size can be increased by purchasing an Armory Expander, which grants the account an additional 240 slots (4 pages).
  • Armory size can be increased up to 34,000 slots.
    • To achieve this starting from a default Armory, one would need to use 100 Armory Expanders.

The armory can be filtered down to specific categories of items, which are saved to provide easy searching. Many filters are provided by default, including Rare Items, Couriers, Wards and Keys and Treasures; however the player can edit these or create their own, whenever they choose, and can be as specific as desired. Other filters include if the items is Inscribed, or even if the item contains a specified word in its description.

Not including ‘All Items’ filter, you can only make 8 editable filters in total.

Gifts can be sent to a friend by right-clicking an item and selecting the Gift Wrap option. This will create a Wrapped Gift containing the item.

Codes from certain promotional merchandise can be redeemed at the Armory for in-game items.

This feature is only available during certain events. It allows players to exchange unwanted items for rewards.

• The Armory used to be called the Backpack.
• Deleting an item in the Armory used to yield a small chance of receiving another item of the next higher Rarity tier. This feature has since been removed.

Base armor is the part of the main armor that never changes throughout a game. It consists of one fixed value set for each unit individually. The base armor of a unit can be a negative number. Since only heroes have agility, the HUD of all non-hero units shows their base armor.

Main armor is the armor value shown in white numbers near the shield icon in the HUD, consisting of base armor and the armor granted by a hero’s agility. The only way to improve a hero’s main armor is to increase its , which is gained by leveling up, acquiring certain items, or with the help of certain abilities.

The main armor is defined as

Main Armor = (Base Armor + (Σ Current)/6) × (1 — Armor Negation)

Main Armor Sources

These abilities directly manipulate points and therefore it affects main armor instead.

¹ Only affects heroes.

Armor Negating Sources

Some abilities negate or ignore a unit’s main armor by reducing or increasing armor based on the unit’s main armor, effectively removing a percentage of the armor on the target. Armor negation only affects the armor value of units, their defense class is unaffected and still reduces damage normally.

Example

How much main armor with a Blade of Alacrity at Level 7 has?

Base Armor: 5

Base and agility gain: 22 and 4 per level

Blade of Alacrity bonus agility: 10

has a total of 15 main armor in this example.

Bonus armor is the armor value shown in green numbers with a plus on the left, right after the white armor number on a unit’s statistics. Whenever an armor granting item or armor increasing ability shows a +Value Armor, e.g. +6 Armor, it increases the bonus armor of the affected unit.

Probably the most important difference between main and bonus armor is that illusions only benefit from main armor, although their HUD still shows the bonus armor just like on other heroes, to make them less obvious to the enemy.

Sources of multiple bonus armor stack additively.

Armor Negation sources do not affect bonus armor.

Example1

How much total armor does a with a Blade of Alacrity and at Level 7 have?

Base Armor: 5

Base and gain: 22 + 4

Blade of Alacrity bonus agility: 10

bonus armor: 6

has 21 total armor in this example.

Example 2

from the previous example is now affected by Level 3 . How much total armor does he have now?

Level 3 Armor Negation: 80%

has 9 total armor in this example.

A lot of abilities and items have abilities that grant or reduce armor.

These changes only affect bonus armor, and are never added to the main armor.

Armor Increasing Sources

¹ Requires talent.

^2a Requires .

^2b Requires .

³ Affects the player-controlled creep.

¹ Affects the player-controlled creep.

Items that provide armor bonus by flat amount and Agility:

All units, including buildings, have an inherent base armor value and attack class. Any physical damage dealt to a unit is multiplied by the damage multiplier, resulting in either damage reduction or increase depending on the target’s armor value.

Damage Multiplier is also used to calculate a unit’s Effective HP (EHP). The lower the damage multiplier, the higher the Effective HP of a unit, vice versa.

For any real-valued armor, the damage multiplier is defined as

With DMu being the Damage Multiplier and R the armor value.

Examples

The total amount of physical damage a unit can take due to the armor it has is known as Effective HP (or EHP). 16.66 armor adds 100% to EHP. This means a unit with 1000 health and 16.66 armor can take 2000 physical damage. The formula adds 6% EHP per point of armor regardless of the previous armor value.

However, EHP value is of a diminished benefit as a player gaining 1 armor from 0 armor would increase EHP from 100% to 106%, while a player gaining 1 armor from 50 armor would increase EHP from 400% to 406%. On the other hand, the effectiveness of armor is much lower at negative values (refer to the attached graph). Total EHP trends downwards towards 50%, meaning a unit with 1000 health and infinitely low armor would still be able to take 500 physical damage. At this point, losing or gaining 1 armor has essentially no effect.

This definition of EHP assumes all damage taken is physical. EHP against magical damage (such as or Finger of Death) is modified by magic resistance.

Effective HP against physical damage is defined as

With CHP being the Current Health and DMu the Damage Multiplier.

Example 1

A Level 25 has a total health of 2176 and 12.3 points of armor without any items. What is his effective HP against physical damage?

‘s damage multiplier is 0.575374 in this example.

‘s effective HP against physical damage in this example is 3781.89.

Example 2

The same Level 25 from the previous example (has a total health of 2176) is affected by a Level 3 , and his armor is now -7.7. What is his effective HP against physical damage?

‘s damage multiplier is 1.31601 in this example.

‘s effective HP against physical damage in this example is 1653.49.