Pretty amazing. The Beacon of the Reed Sea Claymore, The Key of Khaj-Nisut Sword, and The Staff of the Scarlet Sands Polearm are among the best weapons in the game. Dehya, Nilou, and Cyno use them as their signature weapons, and the results have been amazing. If you have any of these characters in your team and want to increase their firepower, then I suggest rolling on their weapon's banner. I got Nilou and her signature weapon, The Key of Khaj-Nisut, in 50 pulls, and I love the synergy the weapon has with Nilou's abilities.