Brute. A melee weapon deals one extra die of its damage when the Undead Orc hits with it (included in the attack).

Regeneration. The Undead Orc regains 2 hit points at the start of its turn if it has at least 1 hit point.

Shortsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage plus 27 (6d8) necrotic damage. If the target is a creature, it must succeed on a DC 9 Constitution saving throw or be stunned for 2 rounds. A creature stunned this way can repeat the saving throw at the end of each of its turns ending the effect on a success. 

Aggressive. As a bonus action, the Undead Orc can move up to its speed toward a hostile creature that it can see.