Thread:Volknur/@comment-15204826-20140911094123/@comment-3186827-20140911125526

Hmm, using the upgrade material as the decider for if a weapon is "unique" of not is a little strange tbh. Both Twinkling Titanite and Petrified Dragon Bones are rare-ish.

To me, the term "unique" means one-of-a-kind or special. In a single playthrough we see:

I think the distinction or the category naming convention needs more thought.
 * Twinkling weapons are sometimes not one-of-a-kind but some have special or unique properties.
 * Boss Soul weapons are per playthrough one-of-a-kind (with the exception of Dragonrider), since they need a soul.
 * Then we have several weapons that only appear once per playthrough, but require regular titanite, like the Giant Warrior Club.