Guillotine

"At birth, together. In life, apart. By death, reunited."
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Requires attunement.
As a bonus action, the user can switch between a +2 great-axe or twin +1 hand-axes with unique properties:
• Hand-axes: On critical hit, the axes deal an additional dice worth of damage.
• Great-axe: On critical hit, a target must make a Constitution saving throw of DC equal to half the incoming damage. On a failed save, the creature preemptively fails a Death saving throw. If the target fails 3 Death