Intent to Kill. As a bonus action on its turn the skeleton picks a living creature, the skeleton has advantage on attack rolls against that creature and can move and extra 30 feet towards that creature on its turn, until that creature dies or the skeleton ends the effect as a bonus action.

Multiattack. the abhorrent skeleton makes one attack with its rusty blade and  one attack with its tentacles, or two ranged attacks with its shortbow. 

Rusty Blade. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Shortbow. Ranged Weapon Attack: +4 to hit, range 80/320 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Tentacles. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage, and the target is grappled (escape DC 10). Until this grapple ends, the skeleton can't use its tentacles on another target.