Hylamity is currently experiencing a bug in Hytale Update 5 that is preventing flying enemies from spawning in prefabs. We believe it may be due to a certain code in Hytale but we are investigating a fix. For now, you can download an early access build on our Discord that allows players to run the mod in Update 5 that contains this bug (Wulfrum Hovercrafts and Drone won't spawn, however). Once it is fixed, we will update the mod on Curseforge as soon as possible. We apologize for any inconvenience this may cause and will attempt to resolve this as we continue production on our next update. Thank you for your patience, we have many big plans in store for the mod!