My Guy Died (Level12 Human Sorcerer)

We were fighting some trolls
 In the warrens below
 Getting close to our goal
 As far as I know
 My dude fails a roll
 And it knocks him prone
 No standards, moves, or minors
 I was totally boned
 It was a critical hit
 From some little minimal shit
 When I heard those little dice click
 I threw a bit of a fit
 Instead of a saving throw
 Instead of a glancing blow
 No medical skills in tow
 I let my character go
 My guy died...
 The coup de grace came up on the 20th side
 Crit
 He had
 11 Strength
 13 Con
 16 Dex
 11 Intelligence
 9 Wisdom
 23 Charisma
 I play a minotaur now
 My guy died...
 The coup de grace came up on the 20th side
 My guy died...
 No death save modifiers could be applied
 My guy died...
 That human saving throw bonus couldn't save me this time