25 pujian for solving my Harry Potter riddle!!! Up for the challenge?

I asked this riddle on the Harry Potter forum and not many people seemed to be interested(although it's still on there, if anda want to try)
so..... I'm posting it here to in hopes that someone will finally solve it!!!!!

I upgraded the prize for the 1st correct answer from 15 to 25 pujian and me as a fan if I'm not already!! If I see many people struggling I will give a hint!!!!


"You saw some of my kind before,
but I was the first anda heard.
I was used to escape trouble (though it led to much more)
the squib would've had anda cornered
but I let anda through the door."

Can be anything of the Harry Potter world - keep your mind open!!!!