The Fireman's Axe is the only tier 4 axe in The Culling. It hits both very hard and very fast. While the base damage might not seem like much compared to the other tier 4 weapons, because of the expose wound that it sets, it still deals 37.7 damage for a full charged attack after your first hit. That coupled with it's high speed rating makes the fireman's axe an extremely versatile late game weapon.
The Fireman's Axe can be found in late-game airdrops.