Damage Over Time Reaping
Reaping can settle an equivalent to a certain duration of Damage Over Time acting on a unit.
When Reaping is caused, it settles Damage Over Time that a unit would have received over a certain period of time at once.
Your Reaping only applies to own DoT effects and can not settle DoT effects dealt by other units.
Reaping directly removes the target's HP, so it does not trigger any damage-dealing events.
Reaping generally has a cooldown time, which is affected by the Reaping Cooldown Recovery Speed instead of the general Cooldown Recovery Speed.
The DoT duration settled by Reaping is affected by affix bonuses such as "+X% Reaping Duration".