Dorcas is Charles Hamilton's wife. One night Morgan Le Faye slipped some poison into Dorcas' food and passed away(just like Merlin's wife) the next day. Even though she isn't a dragon she ended up in Dragon's Rest a placed Timothy and Jasmine established where dead dragons can rest in human form. Later when Billy and Bonnie venture into this place they are able to lead Dorcas and the dragons that chose to come with Billy to the final resting place:Heaven.