Killing an enemy with a fully charged sword will expend all its charge to permanently increase the weapon's damage. Related: Witcher 3: How to Obtain the Cockatrice Stomach In The Witcher 3 enemies seem to come in a constant swarm so keeping the sword charged is hardly a problem. Charges can be lost over time or when receiving damage but a fully-charged sword always deals a critical hit. Located inside of the Blood & Wine DLC expansion, The Aerondight comes equipped with one of the most powerful abilities in the game. Each hit a player makes will generate charges which increase the sword damage by 10%.
The Witcher 3 is loaded with some amazing swords and the one that stands out the most is The Aerondight Silver Sword.