Board Thread:Lore Discussion/@comment-25244530-20140210065930/@comment-6003396-20140210124535

Black Knight Helm description:

"The knights followed Lord Gwyn when he departed to link the flame, but they were burned to ashes in newly kindled fire, wandering the world as disembodied spirits ever after."

Silver Knight Helm description:

"When Lord Gwyn departed to link the Fire, his knights split into two groups. The Silver Knights remained in the forsaken capital in the service of their goddess."

Interesting theory by the way.