Tandem Strike

As a bonus action, you may lock eyes with a compatriot who is engaged with the target, then magically teleport to the opposite side of the target, flanking them. When you teleport, a magical blade forms in your hand until the end of your turn. You may take your action to attack once with the magical blade, which does 2d10 psychic damage + your spellcasting ability modifier, and simultaneously grant your compatriot a single attack as well. This attack does not count as their reaction for the turn. Both you and your compatriot have advantage on the attacks, as you are flanking the target.