Hell-Worthy Berserker

Once per long rest and after 1 week, when you reach 0 HP, you instead remain at 1 HP and go into a berserker rage, regaining all your health as temporary HP.

• During the effect you must perform a Wisdom check with disadvantage every time you receive HP trough any means, on a success, you regain that HP as temporary HP, wich can't go above your HP max.
• The effect ends after 10 minutes, you become inmobilized or are otherwise forced to stop by other effects.
• During the effects you are also incapable of understanding any language or comunicate for that matter and are forced to attack everything in sight.
• If the effect ends and you don't have temporary HP equal to your HP max, you fall prone and must perform a death save to survive, otherwise you fall unconscious at 1 HP.
• You can't regain HP naturally after these effects trigger until you are healed by another source, meaning that a character alone will remain unconscious indefinitely unless rescued.

You may roll a Wisdom save with a DC of 16 to prevent the feat from triggering, on a fail it triggers automatically.