Brute. A melle weapon deals one extra die of its damage when the ranger hits with it (included in the attack).

Shield of Shadows. The ranger can manifest or dismiss a shield composed of shadow as a bonus action. This shield has no weight and attatches to the rangers arm, leaving it free to wield weapons with it. (Included in the AC).

Spellcasting. The Abyssal Ranger is a 9th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 15, +7 to hit with spell attacks). The Abyssal Ranger has following spells prepared:
1st level (4 slots): ensnaring strike, false life, hunter's mark, wrathful smite
2nd level (3 slots): hold person, misty step, silence
3rd level (2 slots): elemental weapon, fear

Multiattack. The ranger make four attacks: three with its longsword and one with its abyssal lash.

Longsword. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) slashing damage. 

Abyssal Lash. Ranged Spell Attack: +7 to hit, range 15 ft., one creature. Hit: 7 (1d8 + 3) necrotic damage. If the ranger hits with this attack the target must make a DC 15 Wisdom saving throw or be grappled. When grappled in this way the creature is also restrained. This grapple lasts until the Abyssal Lash is used against another target. At the end of each of its turns, the targetcan make another Wisdom saving throw.

Master of Pleasures. As a reaction when this creature takes damage, it can magically grant 5 temporary hit points to itself and up to three allies within 30 feet of it.

Wraith Step. When a creature hits the ranger with a melee attack, the ranger can use its reaction to briefly become immaterial, interrupting the attack. As part of this reaction the ranger can move up to 10 feet in any direction without provoking attacks of opportunity. The attacker can choose a new target for the attack, if one is available.