https://wccftech.com/the-witcher-3-mod-stamina-combat/

A new The Witcher 3 gameplay mod that has been released recently promises to make combat more interesting and challenging with a few interesting tweaks.

The new mod created by Parhamlinker introduces stamina-based combat, in the vein of the Souls series. Sword attacks will now consume stamina, so players will not be able to mash their way to victory like in the base game.