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