15mm.co.uk. An offer on a classic 15mm scale monster in the Tabletop Games range of miniatures. An Arch Demon is a creature defined by a high rank of evil. He is high up the chain of the demonic and has a legion of minions to do his bidding. Great for your skirmish and battle games and until the end of the month its 25% off its regular price. We also have new deals and offers for the month. Click through for more! Thanks. GBS