Innate Spellcasting. The skeroloth's innate spellcasting ability is Charisma (spell save DC 10). The skeroloth can innately cast the following spells, requiring no material components:

At will: detect evil and good, jump
2/day: burning hands, expeditious retreat

Magic Resistance. The skeroloth has advantage on saving throws against spells and other magical effects.

Magic Weapons. The skeroloth weapon attacks are magical.

Sneak Attack. Once per turn, the skeroloth deals an extra 3 (1d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the skeroloth that isn't incapacitated and the skeroloth doesn't have disadvantage on the attack roll.

Multiattack. The skeroloth makes four attacks with its claws.

Claws. Melee Weapon Attack: +2 to hit, reach 5 ft., one creature. Hit: 2 (1d4) slashing damage.

Cringe. As an action, a skeroloth can cower in fear. This is a mind-affecting effect. Any opponent attempting to strike or otherwise directly attack a cringing skeroloth, even with a targeted spell, must attempt a Wisdom save (DC 10). If the save succeeds, the opponent can attack normally and is immune to the effect of that skeroloth’s cringing for one day. If the save fails, the opponent can’t follow through with the attack loosing the action, and the attacker can’t directly attack that skeroloth for as long as it continues to cringe. If the skeroloth stops cringing and then cringes again, the opponent may attempt a new Wisdom save to attack it.

Summon Yugoloth (1/day). As an action, the skeroloth has a 40% chance of summoning another skeroloth. A summoned skeroloth appears in an unoccupied space whitin 60 feet of its summoner, does as it pleases and can't summon other skeroloths. The summoned skeroloth remains for 1 minute, until it or its summoner dies, or until its summoner takes a bonus action to dismiss it.