Wyrmlord Saarvith

Wither Sight. Light level does not affect Saarvith's attempts to perceive any creatures, and he has advantage to spot hidden foes within 60 feet of him.

Spellcasting. Wyrmlord Saarvith is a 9-level spellcaster. Its spellcasting ability is Wisdom, spell save DC 17, +9 to hit with spell attacks. Wyrmlord Saarvith has following Ranger spells prepared:
1st level (4 slots): Cure Wounds, Fog Cloud, Hunter's Mark

2nd level (3 slots): Silence

3rd level (2 slots): Conjure Barrage, Flame Arrows

Multiattack. Wyrmlord Saarvith makes 2 attacks with Thornside, or one attack with Thornside and casts a spell.

Thornside. RangedWeapon Attack: +12 to hit, range 80/240 ft., one target. Hit: 11 (2d6 + 5) piercing damage damage, and the target must make a Constitution saving throw, DC 14, or take 3d8 poison damage.

Black Arrow. As a Bonus Action, Saarvith can make his next arrow a Black Arrow. Black Arrows deal an extra 1d12 necrotic damage, and the target hit must make a Constitution saving throw, or take an additional 2d12 necrotic damage.

Eye your Mark. After an enemy misses an attack on Wyrmlord Saarvith, he can use his reaction to focus on that enemy, gaining advantage on the next attack he makes against that creature.