The Mace is a weapon in the series. In the episode Baxter's Gambit, April is seen in the Dojo trying to use it. Splinter is able to use it effectively, but for April, it is very heavy and she is barely able to lift it. The weapon is used by Slash who can easily weild and use it thanks to his great strength.
Do not get in the way when this spiky ball is swinging your way.