Hello everyone! My Name is Sakuritou and although i am known to be a Cho'Gath Main, i do enjoy and play a TON of Senna as my second Pick (ever since Season 12). I have peaked in 1021 LP Challenger EUW while playing Cho'Gath Mid / Senna Support.
I have created my own Senna Build (the "Slow-Build") and do play her frequently with large success. This build makes proper use of the Item "Stormrazor" which works insanely well with Senna's Kit.

I stream all my games on my Twitch Stream (https://www.twitch.tv/Sakuritou) so be sure to say hello, if you are interested!

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here i will give you advices for each Senna Ability:

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[P] Absolution:

You should normally get 20 Stacks every 5 Minutes (that should be your Goal).

Don't die for stacks, its really not worth it.

Play save and get every Stack you can get without being harassed to much by the enemy botlane.

Use Auto into [Q] for an insta Stack.

In easy matchups, try to harass as much as possible.

If your jungle is doing a camp nearby and you have nothing to do, stand beside it and get the stacks of the Monsters.

Use Q to Snipe stacks from far away.

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[Q] Piercing Darkness:

Try to position yourself behind your ADC and in line of the Enemy Champ to hit both the Damage and the Healing Part of the Ability.

Auto + Q + Auto for quick trade + stack

Use Q on Wards/Minions to snipe enemys from far away

Use your Q Slow to make it easier to hit your W or R.

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[W] Last Embrace:

Hide your W Animation with Auto or Q Animation (use Q Slow to hit W easier)

Hide your W Animation inside of E Fog.

Use W on dying minions to insta Root any nearby Enemy.

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[E] Curse of the Black Mist:

Use your E to go in and out of enemy auto-attack range (dodge enemy auto attacks with it)

Use E to savely get into new territory with your team.

Use E to setup ganks with your jungle.

Use E movement-speed out of base to get to lane quicker.

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[R] Dawning Shadow:

Permanently look around the Map to Snipe/Save Enemys/Allies.

Use R for vision when needed.

Combo R with Q Slow or W Root for an guranteed R Hit.

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