Martial Adept

The martial adept feat in PHB sucks. Therefore, players may choose to use the following version:

A character who takes the martial adept feat can choose four maneuvres, and numbers them 1-4.

After a dealing a critical hit, a killing blow or taking a long rest, you may roll 1d4. The corresponding maneuvre is now unlocked and ready for use, with a 1d6 superiority die.