Welcome to Librarium Online!
The codex is kinda wierd. It says the lord can take up to 100 points of equiptment, and a sword thing for an extra 10. does this mean 100 + 10 or just 100? also do all necrons got the sword thingy, cus there is one at the tip of their gun?
You knock 'em down, and they come right back up again ..... NECRONS
The lord can take a warscythe for 10 pts and an additional 100pts worth of wargear if he ops to, so a maxed out lord with warscythe and wargear costed 210pts.
As for the rest of the necrons having a warscythe the answer is NO, except for the pariahs who automatically have the warscythe with built-in gauss blaster.