"Reduces all resistances by ~60"
This includes physical resistance.
So, if an enemy has 60% physical damage resistance, you'd expect to deal 60% less damage right? Right!
Well, since Sapros reduced all resists by a FLAT (not percent based) 60, that means if they have 60 resist, they now have 0. If they had 0 to begin with, now they have -60, giving you ~60% increase in damage.
To make things even better - if you have green jewelry, you can stick some monkey king relics in them to gain another 36 flat reduction.
Sapros is the "best" weapon in the game for a reason, lol.
Do you now understand the power of Sapros?
Sagaris has nothing worthwhile, it's a surprisingly weak weapon...
