Found a huge exploitable glitch....

[Sieg]

Dropping a possessed weapon resets its level without resetting its stats. This makes possessed weapons infinitely upgradeable I guess. I haven't abused it too much, so I don't know what happens if you keep upgrading it.

[TheSociety]

Have you tried it? :D

[devSin]

It's a known issue. Interestingly, it's somehow a problem that was introduced with the Deathinitive Edition (the level gets retained in the original version).

IIRC, if you keep going, eventually the numbers overfill and get stupid.

[蔬菜大棚]

if you do this,the damage is max 52%,the steal is max 43%,the strength(arcane) is max 127,and so on.....