Martyr Logarius

For replay considerations, you can get alternate variants of base game weapons before you can normally unlock them.

from the chest and chalices, e.g. you can grab an alternate Logarius wheel long before you go to Cainhurst, but you can get variants of DLC weapons until you own the regular version.

You actually have to purchase them from Bath messenger vendors that may appear in chalices.

Yeah, I actually found one of them recently and I got the wheel.