An unfinished beat-em-up game made by demo coders (under the name: Genix).
Actually Genix team were: BMC, Thriller, Tom & Jerry, Christian Lier alias WEEE (music), Stéphane SAINT-MARTIN (graphics) and Fabien FESSARD (main coding).
All that exists is a playable demo and a title screen.
Game would use overscan graphics & sampled sounds (DMA for CPC plus). Was meant to be released by Silmarils.
The Retro Gamer article claims that the beat em up scenes in Xyphoes Fantasy are reused from Killing Fist.
more info at: http://www.cpc-power.com/index.php?page=detail&num=1248