De Conselho da Sage - Regras Respostas: abril de 2016 :
If you use Great Weapon Fighting with a feature like Divine Smite or a spell like hex, do you get to reroll any 1 or 2 you roll for the extra damage?
The Great Weapon Fighting feature—which is shared by fighters and paladins—is meant to benefit only the damage roll of the weapon used with the feature. For example, if you use a greatsword with the feature, you can reroll any 1 or 2 you roll on the weapon’s 2d6. If you’re a paladin and use Divine Smite with the greatsword, Great Weapon Fighting doesn’t let you reroll a 1 or 2 that you roll for the damage of Divine Smite.
Além disso: Como apontado por Doval, Jeremy Crawford permite que todos os dados de armas sejam rerollados.
Jeremy Crawford . Isso inclui, por exemplo, um dano adicional de Frost Brand , já que o dano faz parte do dano da arma. danificar-se (não de um recurso adicional).