Pig's Head Amulet

This amulet is carved from bronze and shaped
like a wild boar. It hangs from an iron chain
necklace.
While wearing the amulet, if you can call upon
the spirit of the boar to protect you to become
Relentless in response against the attack.
Relentless. If the character takes 7 damage or
less that would reduce it to 0 hit points, it is
reduced to 1 hit point instead.
If used you must make a DC 16 Constitution saving throw. On a failed saving throw y