Diana in Teamfights

Diana's ultimate at rank 2 and 3 deals bonus damage if multiple enemies are hit. In teamfights, landing R on 2+ champions before the shockwave fires is a massive damage multiplier. Position for this before the fight starts.

Diana is not an initiator into a full health enemy team. She's a cleanup assassin and a secondary engage after a tank has taken the initial peel. Know your role in the fight composition.

Active Zhonya's at the moment your combo ends — not during it. You've already dealt your damage. The 2.5 seconds of stasis is there to survive the counterattack, not to escape mid-rotation.