Most epic comeback of all time? (Chaos Knight)

30 kills, 20k exp, 25k gold behind and still managed to win. :D Never give up. :)
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You should watch dotacinema's comeback series, it will show you that comebacks happen quite often, and can be due to many reasons. If this was you playing, good job on game decisions, you did quite well on deciding what to do at each part of the game. Can definitely be improved, but it was good nonetheless.

Now, here are just 2 glaringly obvious mistakes that can allow to improve by leaps and bounds if you heed them and try not to repeat them.

1. YOU CAN DISMANTLE SnY.
I don't agree with the SnY pick at that stage of the game, but that is personal preference in my opinion. What made me cringe was that you bought a full manta style after SnY, instead of splitting the SnY to make a manta. What you could have done instead, was split the SnY, make your manta, and build the Sange into either a Heaven's Halberd or a Silver Edge.

2. YOU DIDN'T GET A SATANIC OR A HEART
Heart and satanic are 2 of the best items on CK, compared to a bkb that you didn't need at all.