Also, how do i build ember spirit (including skill build)?
item build: Bottle (if mid) ---> Wand ---> Phase Boots ---> Battlefury ---> Battlefury ---> Daedelus ---> Defensive item (linkens/bkb), another Battlefury ---> Rapier
skill build: Chains, FG, Chains or FG (depending on the matchup), SoF, FG, FG, Remnant, FG, Chains, Chains, Chains, SoF, SoF, SoF
I think the flameguard build is much better this patch (SoF/Chains for mid was king last patch, but the nerfs to Ember made this build a lot worse), as is safe lane ember which benefits more from more points in flameguard IMO. FG gives you some early kill power, a sizable defensive boost, and a fair amount of AoE damage in teamfights, especially if people clump. You only really need 2 points in chains for the 2s immobilize and more than 1 point in SoF really isn't going to do you much good early on, it's just useful for setting up chains or gettin the last hit on a runner.
You score kills by simply walking up to people, chaining them, then burning them down with flameguard, finishing them off with your 1 value point in sleight or if you need to, use dat 1 value point in SoF to set up the chains in order to simply walk up and burn them.