Charge. If the veteran skeleton moves at least 10 feet straight toward a target and then hits it with a shield on the same turn, the target takes an extra 4 (1d8) bludgeoning damage. If the target is a creature, it must succeed on a DC 12 Strength saving throw or be knocked prone.

Whirlwind attack. The veteran skeleton can use its action to make a melee attack against any number of creatures within 5 feet, with a seperate attack roll for each target. This special trait can only be used once per day and the veteran skeleton musn't carry a shield (reducing its armor class down to 15). The veteran skeleton right after this attack is slightly unbalanced and is obligated to move to 5 feet in any direction from where it was (the DM may roll 1d10 to randomly draw the new place), opportunity attacks apply.

Longsword. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) slashing damage, or 7 (1d10 + 2) slashing damage if used with two hands.