Board Thread:Lore Discussion/@comment-10209824-20140321195951/@comment-24679176-20140411163533

To King Thane: Maybe not the Soul of the Chosen Undead... but his/her bones! Look at the description of the Sublime Bone Dust:

''They say these are the remains of a saint who cast himself into the bonfire. But we will never know for sure, for soot and ashes tell no story.''

Could it be that all the dust comes from that (or those) particular undead who casted himself into the fire in order to rekindle it?