Damage buff weapons have negative affects on the hold game.
I love the new Burning Blade of Abezeth, which gives 30% more dmg on all monsters.
But if everyone just farm for it, wear it cause it bring boost, and who will spend time to farm for other cool weapons in the game, or spend a single adventure coin to buy new released/need-weeks-to-design weapons of the game????
Nowaday, i see alot of people who just have the burning blade and think they are better than those have farming for ages to have the juggernaut weapons of nulgath - "cause burning blade have dmg boost", that's all.
They will get bored of the game cause they always have to use the weapon with all sets - cause it bring boost.
I suggest when releasing damage boost items, you should include the hold set. That's very succesful with the Archfiend Doomlord set, people can equip the cape or helm and also get dmg boost while wearing other weapons. Which mean they will buy new weapons more offen.
With the Burning blade of abezeth or Necrotic sword of doom, you should create a shop - only accessible for those who have that item- which sell a hold set of that item. So they can decide to equip the helm, armor or cape to get dmg boost and can wear other weapons at the same time. Or quests to earn the set items like you did with the Archfiend Doomlord set.
Sincerely and best wishes.