From Colawikki

Intelligence affects both offence and healing abilities for casters and healers. It also enhances the ability of all players to avoid skill attacks.

1. For casters and healers, intelligence determines a bonus to be added to all offence and support skills. This bonus is calculated as the base damage plus intelligence multiplied by a class based multiplier as follows:

Caster: 3
Healer: 2
Tank: 0.5
DPS: 0.5
For example, if a caster whose intelligence is 55 uses a skill attack whose base damage is 295, the damage bonus will be 295+55*3=460.

This also applies to RadShot.

2. For all players, intelligence allows players to avoid skill-based attacks. The probability of such an attack missing completely (intelligence-based skill resistance) is a function of intelligence, whose maximum value of 0.33 is reached at 100 intelligence points. Note that this is different from CCS Willpower, which allows a player to resist the status effects associated with skill attacks. When a skill attack occurs two calculations will be made:

the attack may fail completely because of the target's intelligence-based skill resistance
if the attack does not fail, the associated status effect may be resisted because of the target's willpower.
Skill attacks typically involve a certain amount of damage (stamina or life) and a possible status effect. Intelligence resists both, willpower only resists the status effect.

Intelligence does not enable a player to resists life and stamina damage caused by enhanced ranged weapons.

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