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Wild Axes except in just one line. As her primary source of damage that she can throw out from far away, she has to make sure to position such that both paths hit the same target for maximum damage. Concentration is the spell that makes her incredibly powerful as long as she plays to its requirements like 
Marksmanship, allowing her to spam her spells to her heart's content. It also allows her to scale better into the game since it affects items, amplifying her damage or utility based on her build. The rest of her spells can aid in ensuring this passive remains active, regardless of being used proactively or reactively which is always nice as a safety measure. Lay down Scurry Spheres in lane to continually apply pressure in conjunction with her Q and protects her from ganks. This is similar to a more defensive version of the previous 
Ice Vortex. It is also a great way to grant allies the same movement similar to a more concentrated 
Stampede. She can also cast it right on herself to guarantee speed in tighter pinches.
Deafening Blast and 
Inner Fire additionally hinder their fighting capability. For as good as this spell is given its cooldown for an ultimate, ethereal is always going to be a double-edged sword for allies, so coordination with them is key to making sure everything isn't screwed over.DOTAFire is the place to find the perfect build guide to take your game to the next level. Learn how to play a new hero, or fine tune your favorite DotA hero’s build and strategy.
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The ultimate is just a more fancy Inner Fire/Deafening Blast and I could say it's very bad for an ult, FOR AN ULT. The only thing that scales is the cooldown and DPS so with this one I can say that it could be great if it's turned to a basic ability.
Concentration on the other hand is a very interesting concept getting a page from Marksmanship, what I think should be a good thing for the ability is to make it it's ult, with this thing he can play a more supportive damage caster from the sides. An active can be neat as well for this ability (if it becomes the ult) where after a certain requirement (whether threshold or successful landing of spells) your next spell get's a disarm and maybe a mute (with a talent).
Scurry Sphere is bad, just plain bad for me at least because this is just Surge, Seer already does this and is a 100% way better. An idea I have is maybe an activatable spell(Similar to Bulldoze)that gives free pathing(except through high ground to low ground and vise versa) everytime you hit your spell. I mean it's a rat after all, or maybe if you still want to preserve the speedy thing maybe an Ability called Rat Lines where Senna will set up flags(or anything that can be "planted") that cannot be seen by enemies (except through True Sight) these flags can be connected to other flags making a line, when in this line or in a radius of them you and your allies gain free pathing through trees (If you put it in the tree lines) and have bonus speed, this way he can be an excellent gank/escape artist with out the need of setting a ball that can be seen by enemies.
Blight scales few things but the damage increase is quite a lot, considering how free it is. Going from 120 extra passive damage at level 1 to 360 at level 3? That's quite a lot and she even has a an active component that further boosts this damage and guarantees her passive to proc. Also while it is just a more fun Deafening Blast, being able to affect allies is heaps of fun. Think of the engaging or saving potential she has with that.
I quite like Concentration as a basic spell at its current power level given its requirements. Because it doesn't work with allies unlike Marksmanship, the numbers will have to be really high to justify it as an ultimate. And I'm afraid if that happens, the power disparity between her normal state and concentrated state might be too large. It could be supplemented with an active like you suggested, but its current simplicity and neatness is something I prefer. If you really think about it, Concentration is essentially her ultimate with Blight merely supporting it.
Uh,