Crescent Blades don't deal the proper melee damage type on a charge attack.

The melee hit of all charged crescents deals "damage" type damage instead of slash or the respective elemental damage of the blade. I also remember Blood Blades being the same way, but I don't currently have one to find that out.

Additionally, when you're using the crescent's charged attack at close range it often results in the projectile not registering a hit which results in wasting 10 mana. I would recommend setting it up so the projectiles don't spawn when in melee range of something, as to not waste your mana.

Start by locating the Crescent Blades charged-attack implementation and tracing both the melee hit damage type and close-range projectile behavior. Check whether Blood Blades share the same paths. Done means charged melee hits use slash or the blade's elemental type, and close-range attacks no longer spend mana on an unregistered projectile.