Alagos 
Weapon (elven long sword)

This weapon has been enchanted to shift the direction of the users attack slightly to aid in striking a creature's weak points. This weapon does 1d8 slashing damage. While wielding this weapon, whenever you make an attack roll against a creature that does not result in a critical, increase the critical strike range of this weapon by 1. On a successful critical hit, this weapon deals 1d8 additional damage (on top of the critical hit damage) and the critical strike range is reset.