I think this is relatively easy to do and quite useful for players to test KD builds. A place where players can choose the element and level of the dragon. No reward needed.
As it is right now, lower level players are stumbling around in the dark figuring out what builds to use for KD. And if they are too low level, they have no time to see if their build can work before the dragon smashes them.
At least with general play, players can test builds in low level dungeons and skirmishes. We need the same opportunity to test our KD builds.
So it would be really nice to have a training ground for this.