Boon of Tempus

Attacks of opportunity no longer use your reaction, but are still limited to one per turn.

Creatures that enter or leave a space leave your melee range, or creatures hostile to you casting spells in within your melee range invoke attacks of opportunity.  

Creatures who disengage, or who are otherwise immune to attacks of opportunity are not immune from them when they come from you.

If you hit a creature with an opportunity attack, that attack deals an additional 1D6 damage.  This shares a type with the whatever damage type made the attack.