Vassal Claw

The Vassal Claw or Seven Star Claw, also known as the Claw Spirit of the Vassal Weapon. The spirit is from another world prior to being summoned to another world, the Vassal Claw is one of the eight Vassal Weapons present in the world which Naofumi currently resides in. The candidates of the weapon have been given the title of Claw Hero, whom they are generally addressed as so by the locals. The current candidate of the Vassal Claw is unknown.

Overview
The first known Vassal Claw Hero is Rhubaldt, a werewolf demi-human of Siltvelt. However, sometime after the four Legendary Heroes were summoned he was killed and had his weapon taken by Takt. Tulina used illusions to take his place but was discovered by Naofumi and Raphtalia.

The Vassal Claw was first seen as the favoured weapon of Takt during his conquest of Raphtalia's World. He used this weapon to "kill" one of the Phoenix birds which caused a devastating explosion for the heroes. He also used a cursed attack from the Vassal claw to kill Queen Mirellia Melromarc and greatly injure Naofumi. However, Takt was eventually defeated during his conquest and Naofumi used his authority as a Holy Hero to strip Takt of all seven stolen vassal weapons. The Vassal Claw flew away among with some other weapons and has not been seen since the fight with Takt

Power-up Method
Skill Mastery - Using the same skill over and over increases its level and enhances the abilities of a skill.

Trivia

 * In the Web Novel, Filo wielded the Vassal Claw.