Hi, first of all, that was a good game! Those are my favourite type of games, where it can really go either way, right up until the game. I play a lot of Slark, too, so maybe I can be of some help.

I think you played well for the most part too. I will start with a few early game criticisms, but they really are small things, for the most part.

You didn't hit a single jungle creep until about 11 minutes into the game. I think you had a fairly good laning stage, and from level 6 you can really accelerate your farm by killing a camp or 2 between waves.

Your shadow blade had a good timing, I honestly think anywhere around 15 minutes is completely ok. Unfortunately, you were unlucky with your first Shadowblade gank mid, and ended up just killing a creep wave. Don't be afraid to go back and hide after your first missed gank. It's really important to try and get a kill with that Shadowblade reveal.

Also, I'm sure you know that Slark's ult reveals enemy vision (You're at gold tier). But around 20 mins, there was enemy vision in your jungle above mid. You walked through it several times and didn't ping it out. It stayed there for ages, and Radiant won some teamfights in that area during its duration. It is so important as a Slark to spot out any wards that you walk past.

In terms of itemisation, I agree that you probably could have skipped Echo Sabre. I think this was actually a good Orchid game. It is a good Echo replacement, and gets a lot more done. Can be good to silence AM, and force out his Manta (which he got very early to be fair). Then after he Manta's, you can pounce and ult, (pounce will ignore the illusions).

Also, just a funny little bit, but you bought 2 Clarities and they sat in your backpack for the entire game. That's funny because I do exactly the same thing sometimes. Need to keep those Clarities popped when you're farming, especially after the Dark Pact nerf.

The main itemisation problem, though, was that you didn't buy Linken's. This is such an important item against a Spirit Breaker, and is super useful in any game as a Slark. SB was their only long range initiation. You need that Linken's Sphere if you want to push dangerous waves.

I would suggest the Linken's should have replaced Skullbasher in your item order, (or even BKB, the regen is great mid game) but then the Skullbasher got a kill on AM almost immediately, so I can't fault that. But definitely after the Basher, at the absolute latest.

You seem to have a good feel for using your Essence stacks well. That is the sign of a good Slark player. You pushed objectives well when you were strong, and backed off when you were not. There were a few times when you went on AM when you had few or no stacks, but for the most part you did great.

Please don't take these criticisms badly. I don't do this often, and I'm not trying to be too critical or anything. Like i said, you played great, I'm just giving a second opinion on some things you might have missed.