After defeating an opponent, ATK is increased by 12/15/18/21/24% for 30s. This effect has a maximum of 3 stacks, and the duration of each stack is independent of the others.
In Game Description
A sword made of blackstone. It has a dark crimson glow on its black blade.
How to Get Blackcliff Longsword?
Obtainable from Paimon Bargain Shop.
Weapon Upgrade Materials
Here’s all material used to upgrade Blackcliff Longsword: