best way to kill knights?

You mean darknuts? 🙄 if you can get into position so that there is a block above you and the darknut above the block and stab the darknut through the block. 😊

hammer, hands down

Oh yeah... I forgot about the hammer 😃 . But the block thing is your best bet if you don't have the hammer or are playing a hammer-less quest.(like the original)

If there's water, and you have the ladder, step out onto the water, and turn around. The Darknuts can't hit you there, but you can stab away to your heart's content. That's one I use quite a bit.

-SirNiko

If you have a sword beam, it's quite easy.
Try to get water of a stone between you and the dn.
Sometimes, it will turn his back to you. then, yust attack.

yeppe go for the water with ladder and the hammer