Cauldron of Blood
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The cauldrons are made of brass and filled with the blood of victims, ritually sacrificed by the Witch Elves to Khaine, Lord of Murder. The cauldrons never spill over; the blood simply never rises above a certain level.
A number of Dark Elf children are offered to Khaine and ritually tested by the cauldrons. The reasons are many: some children are offered because they are born crippled. Most will die but those who survive are considered to be Khaine's chosen.
The precise numbers and origins of the cauldrons are unclear. They seem to be a handful at least and a very small number may be deployed into battle on very important raids and invasions. Each cauldron will always be guarded by two Witch Elves under the command of a Hag Queen, titled the Keeper of the Cauldron.
After each battle a suitable tithe of prisoners of war will be delivered to the Witch Elves, who will sacrifice them to Khaine.
Once per year, on Death Night, the cauldrons are filled with the blood of sacrificed Dark Elves. The oldest Hag Queens will then bathe in the blood and this ritual restores their youth and beauty, albeit only temporally.
Morathi keeps the innermost secrets of the cauldrons to herself, and keeps the Cauldron of Battle, the first and most important one, for herself claiming that it is a personal gift to her. This enables her to maintain her beauty throughout the whole year.