Multiattack

The horseman makes three attacks with its lance or longsword. It can use Temporal Strike with one of these attacks when it is available.

Lance

Melee Weapon Attack: +10 to hit, reach 10 ft. (disadvantage within 5 ft.), one target. Hit: 12 (1d12 + 6) piercing damage.

Longsword

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 10 (1d8 + 6) slashing damage.

Temporal Strike (recharge 5-6)

When the horseman strikes a target with a melee attack, in addition to taking normal damage, the target must succeed on a DC 17 Constitution saving throw or instantly age 3d10 years. A creature that ages this way has disadvantage on attack rolls, ability checks, and saving throws based on Strength, Dexterity, and Constitution until the aging is reversed. A creature that ages beyond its lifespan dies immediately. The aging reverses automatically after 24 hours, or it can be reversed magically by greater restoration or comparable magic. A creature that succeeds on the save is immune to the temporal strike effect for 24 hours.