Reanimated Companion

Medium Undead, Neutral

AC: -

Initiative: +0 (10)

HP: 5 plus five times your Artificer level (the companion has a number of Hit Dice [d8s] equal to your Artificer level)

Speed: 30 ft.

STR
11 (+0)
DEX
10 (+0)
CON
16 (+3)
INT
4 (-3)
WIS
10 (+0)
CHA
6 (-2)

Resistances: necrotic; poison

Immunities: lightning

Condition Immunities: charmed; exhaustion; poisoned

Senses: blindsight 60 ft., Passive Perception 10

Languages: understands the languages you know

CR: -

Death Burst.

The companion explodes when it dies. Dexterity Saving Throw: DC equals your spell save DC, each creature in a 10-foot Emanation originating from the companion. Failure: 2d4 Necrotic damage. Success: Half damage.

Lightning Absorption.

Whenever the companion is subjected to Lightning damage, it regains a number of Hit Points equal to the Lightning damage dealt.

Actions

Dreadful Swipe.

Melee Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. Hit: 1d4 plus your Intelligence modifier Necrotic damage, and the target can't take Opportunity Attacks until the start of its next turn.

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Reanimated Companion

Source: Ravenloft: The Horrors Within - Licenses and attribution