Blunt
From the Castlevania Wiki, the Castlevania wiki
Blunt is a damage type found in Castlevania.
The Blunt damage type involves hitting an enemy with a non-sharpened weapon to create a strong sense of impact.
Weapons that do this include:
Hammers
Maces
Knuckles
While weapons such as these sometimes mix together into related categories (Such as Maces being considered the same as Hammers), they all share a common theme of not being sharp and creating a massive impact. Armors and Skeletons are particularly weak to Blunt attacks, as it shatters the armor or bones easily.
Sometimes, axes are included in the Blunt category of damage types, but that usually doesn't make much sense since axes are sharpened weapons.
