Thread:AVoraciousReader/@comment-28083312-20170609002507/@comment-30270234-20170609015732

No mention of Kravos in either Storm Front or Fool Moon, nor any short stories about him. All short fiction has been published somewhere, except for "A Fistful of Warlocks", which will be published next month, according to JB's site and is a Luccio story. Another story is supposed to come out in September or October, non-DF.

I had completely forgotten about guardian spells, so I'd imagine there might be no other mention. No other way to know for sure than search each and every book for them.