Does anyone know about an old cartoon. It was about these people who (I think) were travelling by a spaceship. And in this particular episode they meet this dargon with a crownjewel. And behind this dragon is some kind of a gate which has souls/sorrow thing that floods out when they kill the dragon.
There are also some strange creatures with a trunk. Or I remember it like that.

So, does anybody have any idea what this cartoon might be? Could have been a cartoonshort too...