Improved Pact Weapon

Prerequisite: Pact of the Blade feature

Description not available (not OGL).
But here is a summary:

The weapon of your Pact can be used as spellcasting focus, the weapon gains a +1 bonus and can be a bow or a crossbow.
Xanathar´s Guide to Everything

Arme de pacte améliorée
  1. DnD 5e Eldritch Invocations › Improved Pact Weapon