Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of Redfall, including a pair of stake launchers, a UV raygun, and the ominously named Grave Mistake. Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down the weaponry of Redfall, including a pair of stake launchers, a UV raygun, and the ominously named Grave Mistake.