You know, it's a good guide and although I never build LeBlanc this way, I can see the potential for such a guide.

My problem with it would be the lane sustain. As you will expect most players to damage you back in some shape or form, an absolute lack of sustain items really cripples you in lane. This is why you can get denied early game very easily and have problems in late because of low CS.
This is precisely why I recommended catalyst the protector in my guide. It helps you stay in lane all the time and make the most out of it.

Second thing is, why would you get Morello's Evil Tome over Deathfire Grasp on LeBlanc? Just can't see the reasoning. 10 AP, 5% CDR and a little MP5 taken over that great active of DFG?
DFG is what makes even your late game potent. Just because of the fact that you can take off ~1/3 of their tank's life in a single shot (unless it's a Galio), not to mention what it will do to squishier targets. DFG adds up to your burst a lot and makes you strong at any point of the game, while this little stats difference would not matter much.

Don't like the rune set also. Strong AP start is good, but you deny yourself any sustain without MP5. 4 greater seal of replenishment isn't enough. Tried it already.
Also, I'd take magic pen. quints. It makes a crucial difference in mid game, ESPECIALLY if you don't take Void Staff as one of your items.
Yeah, you get Fiendish Codex early, but the whole point of MP5 seals on LeBlanc is to sustain her before your first trip back.
+ In my opinion, catalyst the protector sustains you much better due to the fact that it not only replenishes the mana, but also heals you with every level-up.

Masteries also confuse me a little. Why prefer 1 AP over 20% prolonged buff duration? I really suggest you to change that, because Runic Affinity is a great mastery for using blue buff.

Skill set is kind of doubtful. In mid, it's very hard to land Ethereal Chains, so I don't think that maxing them is a good choice. + Distortion allows for a higher burst damage early on and let's you have some AoE damage, which is also nice.

Also, not the duration of the shackle time increases, but the duration of the snare. Shackle time is a constant 2 seconds at all levels.


Please don't take it as me not liking your guide. It has it's uses, I'm more then sure. But I just don't play her this way and strongly believe that there is not much late-game potential with this build. DFG really makes a difference. It also would be nice to see some screenshots of matches using this build.

I can't claim to be a great LeBlanc player, I've seen better, but I hope you will consider this criticism :)