Hi there.

What do you mean by certain situations?
For me, the guide works in every situation.
I will add a passing about fighting certain champions soon, to explain exactly what I am doing.

Thx for the post.

First of all thx for the comment.

I am still convined of the item build and the things I wrote.
This is why:
1) Void Staff
1.1) The Void Staff comes after the boots, the Tear and Mejais Soulstealer, so it isn't really early in the game. Rather in the mid (since it costs 2200 i think).
1.2) I am still convinced of the great impact of this item, since I see it in every game. The thing is, that this reduces the MR of almost any hero to 0 at this point. Though it doesn't reduce it really, because it's not MR-Reduction but MagicPenetration. But for the cause of calculating output damage it reduces the value of MR. You can see, from the AP and MP formulas, that the damage increase is huge. Also you see it ingame, when your Null Spheres do lots of damage and merely ignore the protection of your foes. Though MP wouldn't penetrate below 0 MR, it's worth it, because of the bonus damage.
1.3) Don't forget, that Void Staff gives 70 AP aswell, which is a nice bonus at this time.

2) Morello's and Mana Regen
2.1) Morello's is nice and i love it. But there is nothing more important than the Void Staff, which in my opinion is very underestimated.
2.2) I never have mana or "stay-in-lane" problems with this build. Really. The Tear + the passive of Nether Blade make it possible to stay as long as i want. Usually I go into the middle though.

3) The guide is short.
3.1) You are absolutely right ;-) I just hadn't the time to wirte more at this point. but i will update it soon. I also wanted to write a little passage about fighting other champions.

It is definitely a good build, with good ideas. But, it needs improvements, definitely. It will only work well in certain situations, but if you tweak it a bit, it is a good build overall. Maybe you should rearrange the item orders? I'm going to give you a +1 though, because I see good in this build.

I don't see why such an early Void Staff would benefit you that much. It is only really usable when the enemy has about 100 MR (don't know the maths, but so I've heard).However, getting it lategame wouldn't be a bad idea.
I think you should at least switch Void Staff with Morello's - More CD reduction in early game and a bit of mana reg to stay in lane longer, though you have Tear of the Goddess.

I won't downvote, cause it is not a bad build/guide, but I won't upvote either, since it is a bit short and I don't agree with the item sequence. I think you should add more sections on the playstyle when it comes to laning and teamfights, then it might be a really solid guide. :)