The unpowered Firemace has an unparalleled firing rate, making it highly effective at stunlocking slow, high-HP enemies such as ophidians, weredragons and even iron liches at medium to close range, being even more effective than the Dragon Claw and Hellstaff at doing so. Maximum capacity is 150 shots, or 300 with the Bag of Holding. Neither mode is capable of hitting ghosts and spheres will simply disappear when they bounce into a liquid. The power mode shots may also travel through teleports and can even telefrag the one who fired it. However, if a player has a Chaos Device in his inventory when a powered sphere hits him, he will automatically use it and only lose half of his health instead of dying. Using a Tome of Power causes the Firemace to slowly launch huge metal balls that bounce around, seek enemies, and kill any non-boss (including other players, even in invulnerability mode) in one hit, but deal only 18-144 damage to bosses. The large mace spheres only have a ~11% chance of being spawned, deal 6-48 damage, and spawn two small mace spheres when they bounce (however, the small mace sphere spawned on a bounce does 4-32 damage). The small mace spheres have an ~89% chance of being spawned, and deal 2-16 damage.

When fired, its spikes rotate and it launches one Mace Sphere every 3 tics in volleys of four each sphere is either small or large. Although it looks like an ordinary mace, it is used as a ranged weapon.

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