[mod edit - the following sentence contains a piece of information revealed in chapter 1 of AATE. Please do not discuss information from AATE in this forum.]
Spoiler
We presume the stone is a shard from the "the One Stone". A property of the krill is the blade's ability to cut any stone and not become dull.
The heals of the staff have never been spoken of in their origin, if memory serves, except that they were fashioned by Berek. They survived an attack from covenant's ring. so far, nothing has survived a full blast of wild magic, except the heals and the krill.
so, is the lore or craftsmanship of the krill and the heals the same?
Are the heals of the staff Berek's/Theomach ingenuity that was later refined by Loric?
Or are the 2 completely different in their nature?