S5 Ep16-Contacting the lost king and queen
#16 of The Heroes of Gaia (season 5)
It seems that the Ghost problem was dealt with in a very wholesome way
Dudley had gotten back into the Moonstone castle as the ghost from before showed it's fangs before him and attacked. Dudley then demonstrated his fighting powers by using his psyche, to fight back pretty well as Solaris and Artemis had watched from the sidelines. The Ghost put up a pretty good fight because it was really angry for some reason and Dudley even used his beast trigger sometimes to get more juice as he used the traditional gun shaped one. After he realized that this was not going anywhere that well he started to talk to the ghost in which the ghost responded. Turns out it was the combined spirit of Onyx Moonstone's parents and the grandparents to the moonstone twins as they were angry about dying when Onyx was only a teenager. King Moonstone had showed up to talk with his parents again, and had a final farewell hug before the ghosts vanished. The next few weeks the castle was being restored back to its former glory as the ghost damage was pretty bad in some areas.