Homebrew
Disciplined Formation. If the musketeer is within 5' of an allied creature that isn't incapacitated, it has advantage on any attack rolls it makes.
Musket. Ranged Weapon Attack: +3 to hit, range 120'/480', misfire 2, one target. Hit: 7 (1d12 + 1) piercing damage.
Shortsword. Melee Weapon Attack: +3 to hit, reach 5', one target. Hit: 4 (1d6 + 1) piercing damage.
Any Climate; Any Terrain