From Halopedia, the Halo wiki

Halo Wars 2 concept art.
Voridus wielding Carnifax.

Carnifax is an energy scythe employed by the Jiralhanae warlord Voridus.[1]

Production notes[edit]

While never seen in-game, Carnifax was first depicted in concept art for Voridus produced by Theo Stylianides for Halo Wars 2: Awakening the Nightmare and seen at the top of this page. The weapon was later named and canonised in the Halo Encyclopedia (2022 edition).[1]