Warstorm Surge

You may treat fire, cold, radiant, and force damage
as though it were lightning or thunder damage
and saving throws that apply from your Rites automatically fail as long as
Channel Divinity: Destructive Wrath is active and
you are not unconscious.
Additionally, Whenever you critically hit with a
weapon attack, you may take an Action Surge after
your attack action resolves (on a critical hit, you
can take one additional action step on your turn).
This happens only once per turn.