In an effort to “make the underdark great again” I propose a new monster to make your players wonder.
The Wind Demon was really lift from Dave Hargrave’s Arduin Grimoire Volume I, though I have freely ad libbed and modified as I saw fit.
Wind Demon DnD 5e
Wind Demons appear as 7′ to 8′ tall smooth skinned humanoid with bright electric blue skin and translucent gold bat wings. They have slim build and unearthly grace. The head is featureless with four round silver eyes spaced equidistant around its head. Wind Demons are lightning quick attacking in a flurry with their razor sharp claws.their skin crackles with static electric sparks when they are angry or aroused.
Alignment: Chaotic Evil
AC: 15 Move: 30′ 50′ Size: medium
Hit Points: 99 11D10+33
Str: 16 (+3) Dex: 18 (+4) Con: 16 (+3) Int: 15 (+2) Wis: 14 (+2) Cha: 14 (+2)
Saving throws: Dex +5 Wis +5 Cha +5
Damage resistance: cold, fire, lightning; bludgeoning, piercing, and slashing from non magical weapons.
Damage immunities: poison
Condition immunities: poisoned
Senses: dark vision 120′, true sight, sees in all directions Perception +4 passive perception 14
Languages: telepathy 240′
Magic resistance: the wind Demon has advantage on all saves against spells and magical effects.
Multi attack: 4 claws +6 d10+3 slashing damage
Reaction: Static discharge recharge on 5 or 6. Anyone striking the wind Demon with a metallic weapon or unarmed strike takes 2d10 electrical and must make a dc14 con save or be stunned for one round.