Relentless Impaler

The impaler is magically bound to the ceremonial stake and the sacrificed corpse the ritual caster used to create it. If the impaler is reduced to 0 hit points, it disappears, then re-forms 1d8 hours later in the nearest unoccupied space to the stake and regains all its hit points. The impaler dies only if it is reduced to 0 hit points while either the ceremonial stake is removed from the sacrifice's corpse or the impaler is on a different plane of existence from that corpse.

If the impaler fails a saving throw, it can choose to succeed instead.

The impaler makes one Spike attack and two Wicked Spear attacks.

Melee Attack Roll: +11 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) piercing damage, and the target's speed is halved until the start of the impaler's next turn.

Melee or Ranged Attack Roll: +11 to hit, reach 10 ft. or range 20/40 ft., one target. Hit: 13 (2d6 + 6) piercing damage plus 13 (3d8) necrotic damage.

Twisted, spectral spikes shoot out from the impaler's body. Each creature within 30 feet of the impaler must make a DC 19 Dexterity saving throw, taking 40 (9d8) force damage on a failed save or half as much damage on a successful one.

The impaler teleports up to 30 feet to an unoccupied space it can see. It can then make a Spike attack.

Each creature whose speed is currently reduced by the impaler's Spike attack takes 18 (4d8) necrotic damage.