For my games GWF style bumps the damage die one level (1d8 becomes 1d10, 1d10 becomes 1d12, 2d6 becomes 2d8, 1d12 becomes 1d16 [we play in Roll20, so 16-sided dice can exist, but at the table I'd let the GWF greataxe user choose to either roll 2d8 or 1d12+1d4, if it ever came up.]) which...