In Challenge Mode (basically hard mode), the Twin Furies gain an additional 100,000 life points (and combat stats), a few new abilities and slight alterations to their normal abilities. * Avaryss' Wall Charge ability deals slightly more damage, and will also drop the player's protection prayers if they are hit by it. * The Twin Furies channelled bomb fire blasts deal double damage from normal mode. * Throughout the fight, a red fireball will bounce around the arena. Its impact zone is shown with green arrows (similar to Detonate, although a glitch can occur where this may not appear). If the player is not at least 3 squares away from the impact zone, they will be dealt with up to 3,500 damage. * After the channelled bomb, the Twin Furies will unleash a red and blue fireball i