The Greybeards approach you and ask you, "young one, which Thu'um would you like to meditate on? All of it's secrets will be yours."
Which do you choose?
Here's a list:
Animal Allegiance
Aura Whisper
Become Ethereal
Call Dragon
Call of Valor
Clear Skies
Disarm
Dismay
Dragonrend
Drain Vitality
Elemental Fury
Fire Breath
Frost Breath
Ice Form
Kyne's Peace
Marked for Death
Slow Time
Soul Tear
Storm Call
Summon Durnehviir
Throw Voice
Unrelenting Force
Whirlwind Sprint
Personally, I'm going with unrelenting force so I can clear traffic on the freeway.
You guys? What would you do with it?
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SOUUUUUUL TEAR. I think the power of simply denying a person any type of afterlife is great.