There is no class that can cast stoneskin on another pc or mob. I'm fairly sure there aren't any wands/staves/scrolls that can grant stoneskin to anyone other than the user of said item. Therefore, what you are calling stone skin was likely another spell - invoker shields maybe?

There is no mage that can grant sanctuary and priests can't be warlocks. I'm 99 and 44/100% sure no item does either. So, either someone else gave the angel sanctuary or again this was a different spell.

That and of course, Isildur and Zulghinlour are correct. Sanctuary grants 50% damage reduction against any and all damage, regardless of alignment, type, or source.