Copy and paste from cheatengine page
"Some things I found that I'm not sure if DLC:
00557300 - Cyan-colored Longsword
00559A10 - Black-colored Murakumo
0055C120 - White-colored Blacksteel Katana
0055E830 - Black-colored Rapier
00560F40 - Gold-colored Greataxe
00563650 - Blood-stained Great Club
00565D60 - Blood-stained Caestus
These items have the exact same stats as their originally colored counterparts. And if dropped and picked up again they disappear from the inventory until the character is reloaded.
Edit:
A DLC spell:
020B6060 - Dark Greatsword (Takes two ATT slots, Stat Reqs: 55 INT, 29 FAI; Acts like the Soul Greatsword, but also fires a ranged dark wave attack that travels for a bit then dissipates, does comparable damage to soul greatsword with the blade alone, but one target can be hit with both the wave and blade for about double damage)"