Exhausting effect on the weapon of nergal

what is that means?
i dont see any debuff when i hitting the enemies with it

There was some item I tested which was draining food/water. I don’t remember which one was it though. Could it be the exhausting one?

EDIT: This was actually “wasting” effect which was removed due to some issues with it. No idea what exhausting do (you would think it is something related to stamina).

EDIT2: Possible thing to test, amount of stamina drain of your opponent when they block your attack. Basically, let someone with a shield block your attack with a normal weapon with similar damage (ancient lemurian trident) and with this weapon (spear of nergal). If I am not wrong, it will drain 3 times more stamina for the blocking person when the attacker uses nergal weapon.

That is what I was assuming the weapon did too. For PvE, it seems pretty useless, but might be fun in PvP.