[Kuritza]

There are not many ties between Pangaea and CTis, in my opinion anyway. Perhaps these summons may be some remnant of Sauromatian past?
CTis was probably contributing to Ermorian campaigns when Pythian swamps were conquered (at least its only logical that Ermor would use its lizard auxilaries in a swampy campaign). And there were these twisted death/nature mages, much like Sauromancers of old, but also skilled in blood. Perhaps their wicked souls still cling to their mortal remains in the swamps, heard by Marchmasters of Ctis.
Something like a Witch King revenant , 1d + 1B + 1?BND
And, well, Conj 4 seems a bit too low. Its comparable to Specter, after all.