(Must be a Barbarian)
When using Rage, you must make a Wisdom Saving Throw each turn, on Success you can control your character normally, deciding your targets and actions.
On a failed save, every attack used is a Reckless Attack, you MUST attack each turn, the DM can randomly move you on your turn, and when surrounded by targets, you must roll a dice and attack whichever creature the dice rolls, numbers assigned by the DM. It can be your enemies and allies. Once in the Reckless Rage state, Rage can only be ended by: a Party Member passing a Charisma Check (DC your charisma plus Proficiency), you pass an Insight Check (determined by DM), or are knocked Unconscious.
Certain things can affect your Wisdom Save DC, such as: the longer you rage, the more damage you take, or the defeat of a Party Member makes it harder to save. However: the defeat of an enemy, seeing a party member healed, or being helped calm down by a teammate can make the wisdom save easier.