The Damage Module, usable through an Ability Object, allows any successfully hit target to have damage dealt to it based on the information from the Damage Module for that specific Ability Object.
There are optional settings, such as Critical Hits and Damage Over Time, that will calculate or happen on the the successful hit of a target.
With a Critical Hit, (using the example below) if an AI hit its target, there'd be a 6.25% chance of a successful hit. The generated damage would then be multiplied by 10%, given it was a successful critical hit.
Note: A Damage Module is optional. If the Damage Module is disabled, a successfully hit target will not receive damage or a hit calculation made.