Sorry I didn't see this earlier. Thanks for sharing how to do that! I was going to suggest, if worse came to worse, to create a basic map with all of your custom monsters / NPCs placed down on it and then go into GM mode and right-click and save them to exported NPCs. Looks like your way is more efficient though. I'll try that later. I'm going to try and make some dune spiderlings, perhaps.

Last edited by Shapeshifter777; 17/09/17 08:18 PM.
GMAddon1: Adds almost every single monster and NPC from the main campaign into GM mode, plus a few large custom maps to use in GM mode.