This was one of my favourites in the 90s and still holds up today. It is unique in that the main characters are the baddies, and they're only bad under sufferance. It is a witty and imaginative show which doesn't fall into the trap of condescension and allows the viewer to draw their own conclusions from their imaginations. It is beautifully animated, has a wonderful soundtrack and is in every respect a piece of art. The original Mike Jupp concept piece is available on YouTube and demonstrates that in its earliest iteration this was a much darker piece called "The Dream Thief". Some of that darkness remains lurking in the mountain of Viltheed...
At last there is a full remaster and DVD release available, and with a collectible miniatures line and board game being promised for 2020 we can but hope there will be a bit of resurgence in recognition for this beautiful work.