DP Space!AU Headcannons
Halphas and Phantom Planet
Phantom planet was located in an area where the barrier between this plane of existence and the dimension known as the Ghost Zone is thin and unstable. This constant close exposure over many generations is the reason the halphas are so ghost-like and powerful. The area Phantom Planet was located was generally avoided due to its proximity to the Ghost Zone, even after its discovery. Whilst Phantom Planet was technically a newly discovered planet it had actually been known about for quite a long time; it, along with the halphas as a species, was a legend, a myth, a story to be told to children at night before bed.
Phantom Planet was destroyed by an asteroid referred to as the Disasteroid. Remains of the planet are still floating around its former location. The Space Corps quarantined the area declaring it too dangerous; the destruction of the planet made the area even more unstable.
Halphas only left their planet if their job required it, such as diplomacy and trade. Whilst they did have space transportation and warp drive they did not generally leave their planet. They had isolationist views and tendencies and would not get in the middle of another planets affairs unless it affected them and they had no other choice. This caused other planets and species to resent the halphas due to their lack of involvement in the Pariah Dark situation.
They had started giving up their isolationism and had just agreed to join the Space Corps when the Disasteroid destroyed their planet. Space Corps dignitaries were on their way to the planet when they found it destroyed.
The Disasteroid was made of ectoranium; a rare mineral usually only found in the Ghost Zone. Ectoranium affects ghosts, and by extension halphas, severely.
Dislike and fear of halphas grew after the destruction of Phantom Planet. Whilst some became ghosts others became feral. Ghost halphas are mostly peaceful as long as you did not disturb them. They mostly reside in the Ghost Zone. Feral halphas are more dangerous and will attack without reason; they will even go out of their way to attack you. It is unknown how or why they became what they are, but it there is a theory it had to do with the combination of their tragic loss, the instability of the area, and the ectoranium.