Gain Berserking for  seconds after swapping weapons 10 times.
Allowed Item Types:
2H Weapon (Power Increased by 100%)
Amulet (Power Increased by 50%)
Extracting from a Legendary Item
What is Battle-Mad Aspect
Battle-Mad Aspect in Diablo 4 is classified as a Offensive Aspect. This indicates that it plays a crucial role in your attacking strategies throughout the game. Specifically, this Aspect contributes significantly to swapping weapons of a Barbarian in Diablo 4.
The Battle-Mad Aspect functions is: Gain Berserking for  seconds after swapping weapons 10 times.
How to Get the Battle-Mad Aspect: Location
The Battle-Mad Aspect in Diablo 4 can be found randomly on any Legendary Item.
Entering World Tier 3 or above could boost your chances to get the Battle-Mad Aspect. World Tier 3 is accessible after the completion of the main campaign.
In these higher tiers, the Legendary Drop rate increases, and hence, the possibility of landing the Battle-Mad Aspect increases. Despite this, the exact drop isn’t guaranteed.
Every Legendary item in Diablo 4 shares a table with Legendary Affixes, including the Battle-Mad Aspect. Every Legendary item you get could potentially have this Aspect. However, Unique Items are the exception, as they always carry a specific affix.
Once you’ve obtained the Battle-Mad Aspect, it’s time to imprint it onto your gear. You can do this at the Occultist, the same character where you do extraction. However, keep in mind that the extracted Aspect can only be used once.