Yes, hidden blades are present in Assassin’s Creed Valhalla. In the game, the hidden blade is a signature weapon of the Assassins, and it is used for stealthy kills and assassinations.
To use the hidden blade, you must first unlock it in the skill tree by investing skill points. Once you have the hidden blade equipped, you can use it by pressing a button or key combination to perform stealth kills on enemies. The hidden blade is especially useful for taking down enemies quietly and without alerting other enemies in the area.