PC Gold Staff w/ a very strange modifier...

Anyone ever seen a staff like this before? How much would it go for?

Defensive Dead Staff of Pruning
Energy +9
10-20 damage (req. 10 Domination Magic)
Reduces Weakness duration by 20%
Armor +4
Dmg +15% (vs. Plants)

unsellalbe, very undesirable mods. i seen reduces blindness, poison, weakness, etc on stuff all the time. merch it