Board Thread:Game Help/@comment-27037091-20151002031054

I set up an auto kiting track with mining rails to fight him (because im too lazy to fly around), and it was working really well; the kiting was good, I could slow down to hit him with my solar erruption, and speed up if he got too close without leaving the ocean area. Issue is when he switches to stage 2, he despawns. I've even stopped moving while he changed, and he still despawns... I just want to kill him because he's the last boss I need for my achievement, I've already beat the moon lord, but this guy just keeps vanishing from no where. 