The hidden battlefields below Embergard are not immune to the reach of Nagash and his elite warriors, who are on the hunt for ‘truebone’ – osseous matter imbued with unusual purity – in Warhammer Underworlds. Thanatek’s Tithe is a Flex-style warband of five Ossiarch Bonereapers miniatures, led by the Ossiarch agent Thanatek.