This my guide on how to play Spectre. Spectre is a very strong carry assuming she isn't shut down early on. This build has an emphasis on being able to get kills early on through the use of Desolate and an Orb of Venom.
By maxing out Desolate first you make your ultimate an extremely deadly ability early game and you'll be able to pick off kills without having to risk dives or leaving your lane. So the idea is coming online in the mid game by buffing up your ultimate and hopefully snowballing from there.