Data Log 0.2 - Dr. Alphys Jasper
From what I've gathered about the Royal Family, it seems as though they are all BOSS Monsters. Now, this wouldn't be unusual for a family of high status. However, it is weird for a Monster Child to be born at a level a BOSS Monster is right after they are born.
The Royal Family are close friends of Gaster. They seem to have known each other for a very long time, probably longer than I've been alive. It's fascinating to see the bond between King Asgore, Queen Toriel, and Dr. Gaster.
Toriel, Asriel, and Chara seem to have moved away from the Castle. One can only wonder what happened between the family. Perhaps a rift has formed due to the near-death of the adopted child, Chara.
Asriel is afflicted with a sickness we've started to call Determination [DT] Sickness.
Essentially, it's a sickness brought on by excess DT in a Monster's soul, as most Monsters can't stand lots of DT at a time.
They can expel the DT build-up by using magic frequently, but since Asriel is still a child, he hadn't had much practice or knowledge of magic before he became too sick to expel the DT that had built up over time.
We suspect the sickness came about due to exposure to Chara's human magic.
However, we have found that a Monster can survive DT Sickness if they have at least half of a human soul.
Chara gave half of their soul to Asriel but now suffers from a sickness that is from the lack of DT. Since they are a DETERMINATION soul, they require more DT… we're able to provide a supplement as of now, but they are no longer able to use their human magic.
Further investigation is required.
[Additional Notes attached by Dr. W.D. Gaster;
Asriel was close to dusting by the time we had figured out that half of a human soul would help him. Unsuspected consequences arose with the addition of a human soul, however, as Asriel gained strange abilities regarding flowers, stars, and other things we don't quite know the extent of yet. Further testing is required.]