Hi guys, this is my first selfmade build, i excuse myself already for my bad english but i really try my best.
I started playin this build vs Bots because i wanted to check how this build, in which order is having succes in early mid and lategame.

So after seeing that this build got an HUGE influence, i started playin in normals and lately in Rankeds, with success.
The good thing about it, you are almost not killable.

All you need to do is farming up, get your items, and when you have arrived them, push your lane, and try to gank midlane, invade enemy lowjungler, or ganking botlane with teleport.
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with this build you are no oneshot assassin.
Hextech gunblade is not only giving you a huge sustain in lane or in fights in comb. with spirits visage in fights, the active is also giving you the chance to slow your almost escaping enemy.
So if you build out hextech first or iceborn gauntlet is giving you and your team a massive slow combo for killing any champion you hit with.

ekkos Q slows, your E will slow, your W slows or stuns, and if this is not enough yet your iceborn gauntlet will slow aswell.

So in the most cases the enemy dont except you to be so tanky, cause they are not used to it.
IF you have no great engage in your team, this build gives ekko the job to be the frontline.

all your slows are giving you also the advantage to keep the enemy trapped in your W which will trigger your stun, a heal or flash out can change the whole teamfight.
And when your notice that your team is not following up, you can R and are out of trouble.
or you just Zhonyas and wait for your teams engage.

All in all, this Build needs some real patience and practise to know when you can engage, or when you have to escape.
But all you need to do in early is to farm, because the harass is pretty easy with him to keep the enemylaner behind.
Ganks by the enemy are specially at level 6 a waste of time for them, your Q slow, E dash, W slow/stun or R are just annoying for the enemy so the enemys jungler wont sit your lane.
When you enemylaner is back you have time to push and to wait for a deep ward TP on bot or midlane to help your team getting infront.

So thats from my side.
Try it out and GL in ranks.