The Rending of Palaghast
The supreme beings, rulers of the Domains. Only eight Solars are known to exist, each a ruler of one of the Domains. They claim to be Palaghast's last creation. Some theologians believe they are manifestations of Palaghast himself, having been divided into his separate aspects. They owe this to the fact that the Solars did not arrive until after The Rending.
Clerics who devote themselves to one of the Eight are granted a special boon while in the Domain of their patron. You gain one extra use of your Channel Divinity per day. Starting at 5th level when calculating Destroy Undead, the cleric treats themselves as being three levels higher.