Takakashi Z Weapon Soul Tier up

Key: Takakashi z
Character: Salt
Skill(or transformation): Weapon Soul Tier Up
How well do you know the source material?(obviously not relevant if it's a transformation):yes.

Reasoning: Standing against the odds, Salt, Rosemary and Fiddel attempt to see through the destruction of J.J's phylactery. Salt views  such an item as something that defies nature itself, and thus aims to see its destruction come to fruit. He's far weaker than any other combatant within this scenario, but he stands his ground and maintains his resolve in order to accomplish this dangerous task. The threat of death looms overhead.

 TLDR; help