If you choose to update to version 6.0, please note that this update changes the entire saving system.
You will need to delete all your existing ModeledNPC files and the old jar file, then place the new one on your server. This version uses JSON instead of YAML for saving and storing NPCs, resulting in a much smoother and more efficient experience.
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Added command for making npcs static so now you have
/mnpc look <id> - enable auto look
/mnpc static <id> - disable auto look