Idle Hands Are The Devil's Playthings

Idle Hands is a 90's stoner horror flick, but it would be fodder for a session using 80's Horror - Tunnel of Terror. 

If you are going to take a player's hand, I recommend giving them something to compensate. Perhaps they have 1 free inspiration use per day.

If characters die you can bring them back as zombies, like Pnub and Mick. Their creature type changes from Humanoid (Human) to Undead. They get a -2 to their Dexterity and Charisma scores. They gain Damage Immunity: Poison and Condition Immunities: Exhaustion, Poison. They also gain the following feature:

Undead Fortitude: If reduced to 0 hit points, the zombie must make a Constitution save with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Strangely, despite their undead nature they can still get drunk and high (though they don't gain the poisoned condition) and charmed.

Now for the titular Idle Hand, I started with Crawling Claw stats and then beefed them up.

Idle Hand

Tiny Undead, Chaotic Evil

Armor Class: 16

Hit Points: 28 (8d4+8)

Speed: 35 ft.

Challenge: 1 (200 XP)

Str 20 (+5) Dex 18 (+4) Con 12 (+1) Int 12 (+1) Wis 10 (+0) Cha 4 (-3)

Saving Throws: Dex +6

Damage Immunities: Poison, Necrotic

Condition Immunities: Charmed, Exhaustion, Poisoned

Saving Throws: Dex +6

Skills: Stealth +6

Senses: Blindsight 30 ft. (blind beyond this radius), passive Perception 10

Languages: English, understands but can't speak

Traits

Turn Immunity: The spirit possessing the Idle Hand grants it immunity to turning.

Actions

Claw: Melee Weapon Attack. +7 to hit, reach 5 ft, one target, Hit: 7 (1d4+5) bludgeoning or slashing damage (Idle Hand's choice).