[quote=Honored Brother]
If the Ka are our Necrons, then I think we have our Tau.

Also, are those disrupters EMP devices? Sounds awfully alike.
[/quote]

Yeah, but EMPs would only affect robots. Disruptors shut down electrics AND knock out, paralyze, nauseate, confuse, blind, demoralize and a bunch of other fun but non-lethal effects.
There are also disruptors to deal with mechanical objects, but these won't affect electrics and vice versa.