Sources
CR
Type
Size
Alignment
Movement

Living Blade of Disaster

Small Construct, Chaotic Evil

Armor Class 14 (natural armor)
Hit Points 67 (9d6 + 36)
Speed 0 ft., fly 30 ft. (hover)
STR
10
+0
DEX
16
+3
CON
19
+4
INT
6
-2
WIS
10
+0
CHA
3
-4
Damage Immunities poison; bludgeoning, piercing, slashing, from nonmagical attacks
Condition Immunities Blinded, Deafened, Exhaustion, Grappled, Paralyzed, Petrified, Poisoned, Restrained, Unconscious
Senses darkvision 60 ft., passive Perception 10
Languages
Challenge 8 (3,900 XP)

Traits

Magic Resistance. The living spell has advantage on saving throws against spells and other magical effects.

Unfettered. The living spell can move through any barrier, even a wall of magical force.

Unusual Nature. The living spell doesn't require air, food, drink, or sleep.

Actions

Force Blade. Melee Spell Attack: +6 to hit, reach 5 ft., one target. Hit:26 (4d12) force damage, unless the living spell rolled an 18 or higher on the d20 for the attack, in which case the attack is a critical hit that deals 78 (12d12) force damage instead.

Reactions

Preemptive Strike. The living spell makes a melee attack against a creature that starts its turn within 5 feet of the living spell.

Lore

A living blade of disaster is a blade of disaster spell (see appendix D) with a wicked will of its own. It looks like a floating, black planar rift in the shape of a sword. Like a demon, it craves destruction.