The Crimson Crane had the most experience with the weapons that were created by the Dark Magus. All of them being extremely powerful for them so far. There was Reno with his specially crafted Pestle.
The curse on the item was stated that if Reno stopped creating certain medicines or poisons with it, then all of the boosted power from the items created would rebound back and go to him.
The thing was, Reno's power was related to poison arts. An extremely rare skill, so once in a while, Reno would just not make any items at all, and the power absorbed into him would give him a boost, and he had steadily been growing stronger each day.
There then was Tilon, who had his legendary ranked shield with a number of great effects. To block attacks, charge his own power and create an incredibly large shield. As for the curse, the shield needed to be used in battle once per day, or it would destroy itself.