Actions

Trench Gun. Ranged Weapon Attack: +5 to hit, range 30/90ft , one target. Hit: 13 (4d4+3) piercing damage. Ammunition, Reload (5)
Sabre. Melee Weapon Attack: +5 to hit, reach 5ft, one target. Hit: 8 (1d8+3) slashing damage.
Frag Grenade. The marine throws a high explosive grenade up to 60 ft. Any creatures within 20 ft. of an exploding frag grenade must make a DC 15 Dex save, taking 5d6 piercing damage on a failed save and half as much on a success. The marine can use this ability two times before needing to restock.
Stun Grenade. The marine throws a stun grenade up to 60 ft. Each creature within 20 ft. of an exploding stun grenade must make a DC 15 Con save, becoming stunned until the end of its next turn on a failure and deafened until the end of its next turn on a success. The marine can use this ability twice before having to restock.

Bonus Actions

Bayonet. Melee Weapon Attack: +5 to hit, reach 10ft, one target. Hit: 6 (1d4+3) piercing damage. Can only be used after making an attack with the trench gun.

Reactions

Parry. The marine adds 3 to their AC against one melee attack that would hit them. The marine must see the attacker and be wielding a melee weapon.