Kralta'ain was the war god of the Ice Kral in the I.C.E. Age history. The Lord Warfarer of a ship would pay honor to the war god by sacrificing captives, decapitating them to give their heads as tribute. It was considered necessary if the Warfarer did not wish to lose his ship, as it was assumed the gods will take what is theirs whether it was freely offered or not. There was a special sacrifice for christening war ships, requiring the Warfarer to bleed out several captives onto the deck.
Kral religion was very simple. It was always conducted by the Warfarer on their ship, with dual sacrifices to the war and sea gods.