glad you enjoyed it, I feel his powerball is already fast enough you can chase down people who flash or use ghostblade, so I wouldn't see many situations where having 30% speed would be worth a rune slot. As for the titanic hydra its a splitpush focused build so the cleave dmg helps you push faster and you tend to have to duel quite a bit. The cleave dmg also scales with his health so as he gets tankier, he does more cleave dmg so you only get stronger later in the game, where with full tank he begins to drop off late game as far as fighting since everyone else gets armor/ magic pen.

I am glad you enjoy the guide. There is an item discussion section towards the end where I talk about the items in the main build, and why I chose to build them in that order. I will update it with the items in the secondary builds when I have enough playtime with them where I can ***es the strengths and weaknesses of them.