you got it from obb opb.
1 in a hundred thousand. May as well be impossible.
Edit: I do admit though, I've never seen Giant wisper before now. With that and a cursed/light helm you would be able to get to 20k without slotted necklaces or a worthless quad fabre weapon.
Still, the point was that knights can have far more. I can just amend to 22k, just so that no one can argue further
Edit: Knights can hit 24020 max with the blessed/cursed helm + all the equip you mentioned, just for the record.
EditEdit: If you get another necklace[1] be sure to toss it my way.