Underground adaptation. The Slaughterkin have adapted to their underground home. Once every two turns the Slaughterkin can attack four times: two with it's bite and two with its claws. To do so the Slaughterkin will lose (1d4) health and will have to move half its movement speed for the next round.

Innate Spellcasting. The Slaughterkin Summoner spellcasting ability is Wisdom (spell save DC 12, +4 to hit with spell attacks). It can innately cast the following spells, requiring no material components:

At will: chill touch, toll of the dead

4/day each: false life, inflict wounds

2/day each: Animate dead, blindness/deafness

Summon Dead. If the Summoner is at half health or lower it can use it's blood and a dead Slaughterkin body to summon a Ghoul or with two bodys summon a Ghast. The Slaughterkin will take (1d6) damage whenever it summons a Ghoul and it will take (2d6) damage when it summons a Ghast. The undead will attack anything in sight even the Summoner. If the Slaughterkin dies while casting the spell it automatically fails. 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) piercing damage. plus (1d6) poison damage and the target is poisoned for one minute.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) slashing damage. plus (1d6) poison damage, If the target is a creature other than an Aabicur elf or undead, it must succeed on a DC 12 Constitution saving throw or be paralyzed for one minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.