Your movement speed becomes zero. Choose a friendly creature in range to empower with a team combo attack. On their turn you can use your reaction to combo your attacks together granting them advantage on their next attack roll. If the attack hits the target, your ally treats the attack as a critical hit against the target gaining all benefits of a critical hit.

If you lose concentration or use your reaction in a different way prior to the start of your next turn this spell's effects are lost.  If your chosen friendly creature does not make an attack roll on their turn this spell's effects are lost.