The shadow dragon tragedy

Seeing that the shadow dragons of Tholoria were dwindling away, the other gods sent additional dragons to aid in rebuilding the dragon population. Though shadow dragons were near extinction, most of them still refused the aid of the other gods because they imprisoned their master. A hand full of them did however join with the other gods and are now considered outcasts, even though they may be the only reason their kind will survive. Very few undead dragons remain and those that are still around are extremely well hidden to avoid death a second time.