Vulnerari

Vulnerari (Latin - Lit. "Vulnerable") is a Treasure Tool in the shape of a scimitar used solely by Dainsleif/Trynt Sanders, and formerly Faith Vainomenjen

History
Vulnerari was created by the desires of Faith and Dainsleif. Originally, the owner of Vulnerari was supposed to be Faith and was created by Dainslief's formerly normal scimitar soon after Dainsleif started raising the orphaned Faith and her baby brother Bryan. It was created because Faith and Dainsleif's shared desires were for Faith to have the ability to protect herself and Bryan when Dainsleif wasn't around, since Dainslief had saved them from a Rinne that retreated. And so, unbeknownst to Faith, before she knew of the Crimson Realm, Dainsleif used that to create Vulnerari and gifted it to Faith and offered her lessons on utilizing it properly. However, Dainsleif stole it back soon after the Rinne returned years later and ate everyone in the village Faith lived in's Power of Existence but hers, and used the sword to use against the Crimson Denizen who attacked him after the Rinne was defeated. It has belonged to him ever since.

Abilities
Similarly to the sword Dainsleif's named after, wounds caused by Vulnerari cannot be, usually, healed or regenerated, bearing a resemblance to Sabrac, the Destructive Blade's "Stigma." However, in contrast to Stigma, only wounds caused directly by the blade of Vulnerari itself are unable to be healed, and they do not get worse over time. Additionally, Vulnerari is not totally impossible to negate with a strong enough Unrestricted Method, as demonstrated by Faith. It also shown to be ineffective against Rokurokubi's Multiplicative Heads, likely since the severing of the heads doesn't count as damage to her.