Small unknown, Chaotic Neutral
Armor Class 13 Natural Armour
Hit Points 14 (2d20 + 11)
Speed 40 ft., The Blackspirit cannot fly,it only hovers 1 foot off of the ground
STR
11 (+0)
DEX
12 (+1)
CON
13 (+1)
INT
20 (+5)
WIS
15 (+2)
CHA
17 (+3)
Saving Throws DEX +3, INT +7
Damage Vulnerabilities Radiant
Damage Resistances Psychic
Damage Immunities Force, Necrotic
Condition Immunities Blinded, Frightened, Prone, Unconscious
Senses Darkvision, Truesight, Passive Perception 6
Languages Abyssal Abyssal
Challenge 4 (1,100 XP)
Proficiency Bonus +2
Traits

Body thief  When a creature is stunned in a 40 foot circle, the Blackspirit goes into the creature. When the Blackspirit has a target under it's control,it takes all statistics but hit points

Spellcasting. The Blackspirit is a 4th-level spellcaster. Its spellcasting ability is 12 (spell save DC 10, +2 to hit with spell attacks). The Blackspirit has following  spells prepared:
Cantrips (at will): True Strike, Thunderclap,Sapping Sting
1st level (5 slots): Color Spray, Inflict Wounds,Cause Fear

Light Steal. Whenever any player in a 90-foot radius casts a spell that involves light, the Blackspirit forces the target to make a DC 19 Constitution saving throw or that spell has no effect. If the caster succeeds the saving throw then the Blackspirit has disadvantage on the next ability check.  

Actions

Magic Extensions When the Blackspirit uses 2 of its spell slots the Blackspirit can create 2 magic hands. The Blackspirit can use a bonus action to clench of open the magic hands. When a hand is clenched they can unarmed strike a creature within 10 feet of the Blackspirit. When the Blackspirit uses these hands and hits,the target takes 5 bludgeoning damage.If the target has over 14 armour class,the attack has no effect.

 Soul smoke Melee Weapon Attack: +9 to hit, reach 10 ft., nearest target. Hit: 7. 14 necrotic damage. 

 Soul Stunning Ranged Weapon Attack: +5 to hit, range 100 ft., nearest  target. Hit: 12 necrotic damage. The target is also stunned and incapacitated for 4 minutes

Bonus Actions

Magic Extension Control. Whenever the magic extension action is placed on the Blackspirit then the blackspirit is allowed to use this bonus action. The effect of this is to clench and unclench the magic hands. 

Reactions

Shadow Mist . when the Blackspirit is attacked by a creature that moved and attacked in one turn, The Blackspirit is allowed to use this reaction to move behind that creature. the target the Blackspirit moved around must make a DC 16 Constitution saving throw or be frightened. The creature must repeat this saving throw until it succeeds

Legendary Actions

Enter the description for how legendary actions work for your monster here.

Legendary Action Name (Costs # Actions). Enter the description for your legendary action.

Mythic Actions

Enter the description for how mythic actions work for your monster here.

Mythic Action Name (Costs # Actions). Enter the description for your mythic action.

Description

A Blackspirit is a uncharted creature with no known history. A Blackspirit is a creature that can overtake the mind if the target does not have a strong will against it.Blackspirits never travel together.

Lair and Lair Actions

Enter a description of your monster's lair here.

Lair Actions

On initiative count # (losing initiative ties), the [monster name] takes a lair action to cause one of the following effects; the [monster name] can’t use the same effect two rounds in a row:

  • Enter a description for a lair action.
  • Enter a description for a lair action.

Regional Effects

The region containing a legendary [monster name]’s lair is [enter the effect description], which creates one or more of the following effects:

  • Enter a regional effect description.
  • Enter a regional effect description.

If the [monster name] dies, these effects fade over the course of #d# days.

Habitat: Underdark

RowanDm