I went into a cave that was nearby my HUB and was attacked and nearly killed by an invisible enemy so I ran. Now that invisible enemy is harassing me at my HUB. I have been killed a couple of times by it and is really getting on my nerves. I saved and restarted the game but it is still hanging around. I can hear it and can see little dirt spirts when it is coming for me. Looking at the wiki I think it might be a Stinger.