Ability Damage

is one of the player Stats. It is the damage dealt through any given item or weapon when using its ability.

Weapons with Intelligence Scaling, or Int Scaling, means that your damage will scale per intelligence point. The higher intelligence scaling, the more damage there is per point of intelligence.

Increasing Base Ability Damage
The skill increases ability damage by 0.5% per level, up to 30% at level 60. Increasing base and  can also indirectly increase ability damage. Base ability damage from Enchanting is rounded up.

Increasing Bonus Ability Damage
Having high increases the ability damage of items in the game.

The Sheep Pet can increase ability damage from 0 to 20 depending on the level. The ability goes up by 0.2 every level. If a Minos Relic is applied to the Sheep, then it will be increased to 26 at level 100. If is then used on a weapon with an ability, then the ability damage will carry over to the weapon which will then be buffed by its stars inside Dungeons.

The Loving reforge obtained from the Red Scarf Reforge Stone increases damage done by abilities by 5% when applied to a chestplate.

Formula
$$\text{Ability Damage} = \text{Base Ability Damage} \times \left(1+ (\frac{Intelligence}{100}) \times \text{Ability Scaling}\right)$$

See table above for ability scaling

Maximum
Highest possible can be acquired by combining all of the following: Combining all of the above will result in 202, this setup however is not recomended because Daedalus Axe has no ability to be boosted by said stat and because Necrotic Reforge results in higher damage output
 * A level 100 Sheep Pet with Minos Relic equiped (26.6)
 * Daedalus Axe with Chimera 5 applied to it (+200% on a pet)
 * Wither Goggles upgraded to at least 5 dungeon stars (49.5) and reforged to Renowned (1% to all stats), any chestplate reforged to Loving (5) and any Leggings and Boots reforged to Renowned (2% to all stats)
 * Mayor Jerry being elected mayor with Barry as a secondary mayor (15 and +10% to all stats)
 * Enchanting level 60 (30)