I don't think the fact that ebilias and jaakus are dead is a problem. When a creatu die, the die. They go to the grave and you can do the quest. This applies to all creatu including jaakus and ebilias. As long as they can die, they can take on this colour. Okay?
I think think the only problem is that they are that colour in the first place, anc none of the creatu have that problem.
Anyways, no one said ebilias were undead (if you read the jaakus one, they are undead, but definitly not ebilias)
"The Ebilia is a nocturnal-like Creatu, but it isn't like any normal nocturnal animal, its eggs can only be found via a random event in the Halloween period. Once their glowing egg is hatched, you will have a sly, but mystical-like cat with glowing yellow eyes. It is said their glowing eyes can see into the future and predict bad events. As the Ebilia grows from its cat-like form, it sprouts bat-like wings and its fur begins to shed to the bone. As it grows, it also becomes quicker. When it reaches its final form, it is almost a complete skeleton; its fur has depleted from its skull and many other parts of its body. Its wings have cobwebs and spiders can be found dwelling near the appendages. Once this form is reached, it is said to be almost invisible as it flies through the dark skies of planet Reiflem. Some say that if you have the final form of the Ebilia, your luck around Reiflem will be increased, thus improving your chances of getting rare eggs, even if they aren't found in the area. It is also said that your resurrection quests will be easier, unless you are trying to resurrect the Ebilia, then it will be more difficult. At the moment, however, there is no proof that these rumors are true."
The deion only states they are nocturnal and sheds their bone and skin.
Oh yeah, Panda, I don't think people killing their pets for this is a problem. As long as they are prepared to take this risk and are organised enough to complete the quest in time, it's fine. It's their loss if they fail.