delicate valve
(You have 20 minutes to defeat kaigaku..He will be at the same place where he fought zenitsu-infinity castle.Kaigaku will have he's own bda also called blood demon art "Black thunder")
If you have thunder breathing they will be a special technique called "flaming thunder god" To defeat kaigaku in the last moments the move can be an ultimate when he beheaded kaigaku
Description for the technique called flaming thunder god
Description:"A electrifying strike that unleashes a maelstrom of fiery fury, leaving opponents scorched and reeling"
raw sky
