Turn 1:
>me 1st action: Create Water on your group, getting you vulnerable to Lightning damage
>Shadowheart 1st action: Twinned Witch Bolt upcasted to level 6 with channel divinity and Luck of The Far Realms crit for 288 damage on 2 enemies, gains 1 action from bloodlust elixir
>Shadowheart 2nd action: Quickspell Witch Bolt upcasted to level 5 with Rhapsody crit, up to 240 damage
>Shadowheart 3rd action: Twinned Haste
>Shadowheart 4th action: Chain Lightning (arcane battery) with Channel divinity for 160 damage on 4 enemies
>me 2nd action: Twinned Chain lightning with channel divinity for 336 damage on 4 enemies, gains 1 action from bloodlust elixir
>me 3rd action: Twinned Witch Bolt upcasted to level 6 with channel divinity and Luck of The Far Realms crit for 288 damage on 2 enemies
>me 4th action: Quickspell Chain Lightning (arcane battery), up to 160 on 4 targets
Your response?