Chaos Knight is a hero who is generally not playing in the pro scene unless paired for a wisp because his disables are a little clunky, and his mana pool is very weak, but once you make it into the mid game with chaos knight, his damage can be seriously impressive with his ult.
This game is obviously a bit atypical since I went mid and got a midas, but the same couple of items still apply. You purchase treads and armlet, and you go into heart and other strength items.
If I was playing this super serious I'd go treads into Drum, then either Armlet or BkB(looking back, BkB was a bit safer this game). Heart should be one of your late game pickups, and I kind of needed a monkey king bar against the PA, or my damage output was a bit limited.
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