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Blocking is capped at 75% effectiveness. Any % above 75% is irrelevant. Dexterity raises a character's % chance to block. Some items and skills also increase blocking %.
When defense "blocks" an attack it has no animation and it will not interrupt your attack (or casting). This is different from the Shield block animation or the amazon D/A/E (which will interrupt your attacks even if you don't get the animation)
* See the [[Defense 101]] article for more details.
==Blocking Formula in Diablo 2 Lord of Destruction==
Chance to Block (CTB) with a shield is calculated via a straightforward equation based upon only three variables: Your character's level, your dexterity level, and the shield's base blocking percent for your character's class (plus modifers). In equation form:
<blockquote>Total Blocking = (blocking * (dex - 15)) / (cLvl * 2)</blockquote>
where
* blocking = A total of the blocking on all of your items. Keep in mind that shields with "+x% Increased Chance of Blocking" have already added their bonus to the shield's blocking percentage that you see when hovering over it.
* dex = The character's base dexterity plus all dexterity bonuses (f.ex. charms, equipment)
* cLvl = The character's current level
The result, Total Blocking, is then capped at 75%, meaning that the chance to block cannot be increased above this by any means. This percentage applies to standing still, melee attacking, and walking. Running, however, reduces the chance to 1/3rd of the original value, with a cap of 25% chance to block.
<blockquote>Running Block Chance = 1/3 * Total Blocking</blockquote>
Because equipment plays a crucial role in how much dexterity is required to reach the maximum 75% chance to block, many players calculate their required endgame dexterity based upon their planned endgame gear, not what they are currently wearing (which would require more dexterity for a given endgame cLvl).
