Qual seria a classificação do desafio para esse inimigo personalizado do NPC? É definitivamente mais de 8, mas eu não sei o quê. Em essência, é um Drow Elite Warrior combinado com um Assassino:

Drow Elite Assassin

^{Medium humanoid (elf), neutral evil}

Armor Class 16 (Studded Leather)
Hit Points 75 (10d10 + 20)
Speed 30 ft.

\begin{array}{cccccc} \text{STR} & \text{DEX} & \text{CON} & \text{INT} & \text{WIS} & \text{CHA} \ 14\;(+2) & 18\;(+4) & 14\;(+2) & 12\;(+1) & 14\;(+2) & 12\;(+1) \end{array}

Saving Throws Dex +7, Con +5, Int +4, Wis +5
Skills Perception +4, Stealth +10
Damage Resistance poison
Senses darkvision 120 ft., passive Perception 14
Languages Common, Elvish, Undercommon
Challenge 8 (3900 XP)

Fey Ancestry. The Assassin has advantage on saving throws against being charmed, and magic can't put the Assassin to sleep.

Sunlight Sensitivity. While in sunlight, the Assassin has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Assassinate. During its first turn, the Assassin has advantage on attack rolls against any creature that hasn't taken a turn. Any hit the Assassin scores against a surprised creature is a critical hit.

Evasion. If the Assassin is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, the Assassin instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.

Sneak Attack (1/Turn). The Assassin deals an extra 13 (4d6) 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 Assassin that isn't incapacitated and the Assassin doesn't have disadvantage on the attack roll.

Innate Spellcasting. The Assassin's spellcasting ability is Charisma (spell save DC 12). It can innately cast the following spells, requiring no material components:

• At will: dancing lights
• 1/day each: darkness, faerie fire, levitate (self only)

Actions

Multiattack. The Assassin makes 2 attacks.

Drow-poisoned Dagger. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft., or range 20/60 ft., one target. Hit: 6 (1d4+4) piercing damage. A creature subjected to this poison must succeed on a DC 13 Constitution saving throw or be poisoned for 1 hour. If the saving throw fails by 5 or more, the creature is also unconscious while poisoned in this way. The creature wakes up if it takes damage or if another creature takes an action to shake it awake.

Reactions

Parry. The Assassin adds 3 to its AC against one melee attack that would hit it. To do so, the Assassin must see the attacker and be wielding a melee weapon.