Bladed Axe made its first appearance in Season 6 of Call of Duty: Black Ops Cold War and Warzone. It is a two-hand held melee weapon. Here's a guide on multiple ways to unlock the Battle Axe in Call of Duty Season 6.
Unlock the Bladed Axe in Call of Duty: Warzone and Black Ops Cold War Multiplayer
Unlock Criteria — "Get a kill with a gun, melee weapon, and piece of lethal equipment in the same life in 15 different completed matches."
The challenge is pretty simple but may require some time to finish. For BOCW Multiplayer, hop into any game mode and try finishing the challenge. Remember not to leave the match in between or the progress will not count.
As of Warzone, get into a game of Plunder and finish the mission. But you don't have to stay the whole match. You may leave the match after completing the challenge. Just head over to the loadout menu and make sure the progress is registered.
Unlock the Bladed Axe in Call of Duty: Black Ops Cold War Zombies
Unlock Criteria — "Using a primary melee weapon, kill 10 Abominations."
This method is faster than the previous one. Start a game of Onslaught Elite in CoD Zombies. Keep damaging the Abomination with any powerful weapon until a sliver of its health is left. Finally, kill it with a melee weapon to gain one progression point.
Fastest Way to unlock the Bladed Axe in Call of Duty Season 6
Although this is the fastest way, you will have to spend money on it. You can buy The Berserker Bundle from the COD Store. It costs 1000 COD Points and gives you a cool-looking Bladed Axe blueprint — Battle Axe.
For more Call of Duty guides, check out How to get the Scream Ghostface Operator Bundle in Call of Duty Warzone on Pro Game Guides.