Agony mace

There’s a mace called ‘Agony’ . Could any1 plz explain what does Increases Armor by -30% mean? I suppose it should read ‘decreases armor by -30%’. That using of ‘increases’ and ‘-’ is misleading

I think they didn’t have an effect ready to decrease the armor so they just use the existing one and made a negative “increase”.

Thanks for your reply. So it is 100% surely decreasing monsters’ armour, right?

Yes, it is decreasing it, but it is a REALLY badly worded proc, partially because they don’t have proper wording for it in this case.