I have a player in one of the games I'm running that's a Goliath Paladin. He uses a greataxe and recently asked me if he could deal more damage like a "Large" monster could since he has a powerful build.
The following is quoted from p.278 of the DMG:
Big monsters typically wield oversized weapons that deal extra dice of damage on a hit. Double the weapon dice if the creature is Large, triple the weapon dice if the creature is Huge, quadruple the weapon dice if it's Gargantuan...
So since he counts as one size larger than medium, I thought that this rule could apply to him. However, the powerful build mechanic only states:
You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.
My players are usually good, and don't try to "break the game", but before I make a decision, I would like to know what a community of other players and GMs would think about this. Would he be able to deal extra damage?