[Discussion]: Senna - First Impression
[Disclaimer: This is going to be a long post. The Tl'dr is at the bottom. Sorry in advance for the wall of text]
So finally after what felt like an eternity, Senna has finally come to the PBE for testing. Played around with her for a little bit in the practice tool (I plan on making another post on her once I get a few games with her in Normal Draft) & I wanted to share my 2 cents on what I think of her so far.
#Abilities:
[Passive: Absolution] https://1.bp.blogspot.com/-kOZHm174IjY/Xbj-YjxMvqI/AAAAAAABarc/KvRrF7kSDaEeRHEx7VcMlGHhmOr61rmzgCLcBGAsYHQ/s1600/sennapassive.png
My thoughts - I honestly thought that with the way her passive works, she would have infinitely scaling crit. It's reassuring that this isn't the case & that instead she gets life steal after reaching the cap of 35%. What's interesting about the passive is that while She could possibly use Spectral Sickle, she might honestly benefit from using Spellthiefs a bit more since it converts the AP into adaptive Force.
Her Relic Cannon passive also makes it so her auto attacks have a brief windup time (Kinda like Grave's Autos, except Senna can't reduce the windup with attack speed). I also noticed that her Attack Speed doesn't seem like it scales very well. During my intital tests, I was only able to get up to 0.99 Attack Speed with just 2-3 attack speed items (Attack Speed Items used during these tests were 
).
[Q: Piercing Darkness] https://1.bp.blogspot.com/-JW6P7gOk0dU/Xbj-YkOOqhI/AAAAAAABarY/2Z2OrluZx84A86B1LJgbu583tFGZ9Yo5wCLcBGAsYHQ/s1600/sennaq.png
My Thoughts - This ability feels good to use, I'd probably prioritize this ability above her others. It works exactly like Lucian's Piercing Light , where you can use it to poke enemies through the minion waves. Only difference is that it can be used on Allies to heal them up and poke enemies down. This ability seems like it'll be easy to use for those who are new to the character, but will also come naturally to players that have experience with Lucian.
[W: Last Embrace] https://1.bp.blogspot.com/-w03RhC5RQC8/Xbj-Z846voI/AAAAAAABark/oviU4nNNICspgNLj8F6B8LsV2oRSPew9QCLcBGAsYHQ/s1600/sennaw.png
My Thoughts - This ability has pretty decent range (Just as long or a little bit shorter than Caitlyn's Q) & has some gnarly base damage, going as far as 250 at Rank 5. The CC it provides is also fairly decent as well, it's not over bearing like say Morgana's Darkbinding but provides you enough time to set your other abilities up.
[E: Curse of the Black Mist] https://1.bp.blogspot.com/-4Pbr_QClzd0/Xbj-YgfIv0I/AAAAAAABarU/yBALK_JAAd4KOn-VQJdV-_0qHugV_6XGQCLcBGAsYHQ/s1600/sennae.png
My thoughts - So if there's one part of Senna's Kit I feel like will be a hassle to deal with, it might be this ability. It provides Camouflage (Invisible, unless you're in close quarters) to Senna and her allies, so Champions with gap closers & reveals (Lee Sin being perfect for the job) can be really good to have when faced with Senna.The Wraith Buff also masks your Allies identities so you won't be able to tell which ghoul is who, so you'll have to be careful when picking one of her teammates out of the Mist. Senna's [E] also synergizes extremely well with Duskblade & can even be useful for allies that are using that item like Zed or Talon (I swear that's going to keep me up at night).
[R: Dawning Shadow] https://1.bp.blogspot.com/-2aElW4UrAbU/Xbj-Zcf-NHI/AAAAAAABarg/djhACE4-_Z0YFI07NL-xTLgVSvDkXXBWACLcBGAsYHQ/s1600/sennar.png
My Thoughts - This ability is honestly feels like it's better suited to Teamfighting than using it purely for damage. It deals decent damage to enemies that are caught in the center of it's Radius and shields allies that are caught anywhere in the blast zone (it's a shield granting skillshot that you won't miss). I can definitely see Senna being picked for this ability as it has plenty of utility for teamfighting, plus it's global so you can help out in fights even if you aren't actually there.
As of right now posting this, I feel like Senna feels pretty good & definitely worth picking up. It's too early to tell if she'll be ban worthy, but I believe she might end up being banned solely for the interactions between Senna's [E] & Duskblade. I'm going to continue doing more tests with her & hopefully make an update at some point.
#Tl'Dr
Senna's has been released on PBE. She feels pretty good to play & might not be as overbearing as Pyke or Yuumi, but her Synergy/Interactions with Duskblade might prove to be really strong.
