i did the hercine quest for the shrine south of the imperial city and i killed the unicorn much to my discust! are there other unicorns or was it unique because its very cool that you can ride them!

It was Unique.
Actualy you COULD ride it,but with no real point.
First time i saw him,it attacked me.Then i snaped an Invisibility potion,mounted the Unicorn and run away!!!
Later i realised that i can't relly on the Unicorn to stay in a stable,wait for me in front of cave and so on.....Long story short,it behaved like a stolen horse........So,no point in having it really.

However,there is a better horse named Shadowmere.If you want to know more of it you can go to this thread.

EDIT:This should be in the spoiler section.

I thought that the Unicorn was going to be the best mount that you could obtain. I was really dissapointed when I found out that you had to kill it for Hircine and that it wouldn't stay in the stables if you chose to spare it instead of kill it

thanks for ur input just gutted i cant keep the unicorn i have already got shadowmere from the dark brother hood quests