The Rod of Cruor
The Rod of Cruor is a +2 Arcane Implement. It spent decades collecting blood under a sacrificial altar.
It has 18 charges. Charges can be replenished by draining a creature's blood. Tiny = no charges, Small = 1 charge, Medium = 2 charges, etc.
The charges can be spent on the following:
1) Poison Spray. 0 Charges: You spray toxic blood at a creature within 30ft. Make a ranged spell Attack for 2d12 Poison damage.
2) Crimson Spray. 1 Charge: You launch a disgusting eruption of blood. Each creature in a 15ft Cone originating from you must make a dc15 CON Save or be Blinded until the end of your next turn.
3) Summon Putrid Undead. 3 Charges: An Undead creature made of animated blood manifests in an unoccupied space you can see within 90ft & disappears when it drops to 0 HP or in 1 hour (Concentration). It acts as an ally on your Initiative & takes its turn after yours. It obeys your verbal commands (no action). If you don’t issue any, it takes the Dodge action & moves to avoid danger.
Putrid Undead. Medium NE Undead.
AC 15. HP: 40
Spd:30ft.
STR 12 (+1) DEX 16 (+3) CON 15 (+2) INT 4 (-3) WIS 10 (+0) CHA 9 (-1)
Immune: Necrotic, Poison; Exhaustion, Frightened, Paralyzed, Poisoned.
PP10, Darkvision 60ft. Languages: Understands you.
Traits: Festering Aura. Each creature that starts their turn within a 5ft of the undead must make a dc16 CON Save or be Poisoned until the start of their next turn.
Actions: Rotting Claw. 2 Attacks. 5ft Melee Attack: 1d20+6 for 1d6+9 Slashing & if they are Poisoned, they are also Paralyzed until the end of their next turn.