How were you able to make it so that you could summon a Cursed Servant?
Basically it requires you to use the extractor/reader tool that has been posted in these forums. If you wanted, you could even have an astral dragon as your summon.
In the Skilldata.txt file, there is a line that says:
data "Template" "e0aa9fb2-6eeb-47b5-8eff-28e15bebec60"
That string of letters and numbers is referencing a .LSB file elsewhere. Thus, if you go open one of your .LSB files and find a creature that you like, find the "MapKey" in the sidebar, copy it, and paste it overtop of that string of letters and numbers. In this case, the line of code that I pasted up there is referencing an Astral Dragon. If you use that line of code in your skill for summoning, you'll get a giant astral dragon as a pet.