If you want to use Bennett's potential as a support, he'll help improve your team's damage output even further with the help of the 4-piece Noblesse Oblige which gives your team an additional 20% attack. Keep in mind that this effect cannot stack with another 4-piece Noblesse Oblige.

Does Bennett buff stack?

This effect cannot stack.

How does noblesse oblige 4-piece work?

The 4-Piece Set Bonus is what makes the Noblesse Oblige one of the best artifacts for support characters. It boosts the damage of Elemental Bursts and buffs the whole team for a short time.