Sources
CR
Type
Size
Alignment
Movement

Nagpa

Medium Monstrosity (wizard), Neutral Evil

Armor Class 19 (natural armor)
Hit Points 203 (37d8 + 37)
Speed 30 ft.
STR
9
-1
DEX
15
+2
CON
12
+1
INT
23
+6
WIS
18
+4
CHA
21
+5
Saving Throws INT +12, WIS +10, CHA +11
Skills Arcana +12, Deception +11, History +12, Insight +10, Perception +10
Senses truesight 120 ft., passive Perception 20
Languages Common plus up to five other languages
Challenge 17 (18,000 XP)

Spellcasting

Spellcasting. The nagpa casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 20):

At will: detect magic, mage hand, message, minor illusion

1/day each: dominate person, etherealness, feeblemind

2/day each: fireball, fly, hold person, suggestion, wall of fire

Actions

Multiattack. The nagpa makes three Staff or Deathly Ray attacks. It can replace one attack with a use of Spellcasting.

Staff. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:9 (2d6 + 2) bludgeoning damage plus 24 (7d6) necrotic damage.

Deathly Ray. Ranged Spell Attack: +12 to hit, range 120 ft., one target. Hit:30 (7d6 + 6) necrotic damage.

Bonus Actions

Corruption. The nagpa targets one creature it can see within 90 feet of it. The target must make a DC 20 Charisma saving throw. An evil creature makes the save with disadvantage. On a failed save, the target is charmed by the nagpa until the start of the nagpa's next turn. On a successful save, the target becomes immune to the nagpa's Corruption for the next 24 hours.

Paralysis (Recharge 6–6). The nagpa forces each creature within 30 feet of it to make a DC 20 Wisdom saving throw, excluding Undead and Constructs. On a failed save, a target is paralyzed for 1 minute. A paralyzed target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Lore

Long ago, the Raven Queen cursed a cabal of powerful wizards for meddling in a ritual that would have helped avert a war between the gods. She transformed them into the scabrous, birdlike creatures known as nagpas and rendered them able to acquire new lore and magical power only from the ruins of fallen civilizations and great calamities.