Add a Sealed Sword line that will deal pure normal damage, and the charge will also be the same charge, maybe expect at 4* or 5* include Curse on it.
P.S.: I am not a guy who likes swords, just want to give sword bearers more freedom (which is very ironic).
If this is actually going to happen,there shouldn't be Curse chance in the charge attack.Maybe higher statuses at 4* and haze at 5*.