Percy Jackson and the Olympians: Legends

For every enemy slain, the sword gains a +1 cumulative bonus to attack and damage rolls, lasting until the end of the encounter. When the wielder's hit points drop below half, they gain resistance to all damage types for 1 minute, and their Strength score increases by +2. On a critical hit, the target must make a Constitution saving throw (DC 18) or be stunned until the end of their next turn. Additionally, the sword deals an extra 4d6 fire damage.