Password cracker help?

I've been playing a game called graal, and I'm getting REALLY annoyed at this guy named 'Cookie', so I was thinking of hacking him xD When you sign up, it gives you a random pass, so social engineering wouldnt work. I was thinking of trying to find his email then hack it to find his password, and then get his account banned :3

If anyone could help me make an email password cracker, that would be great :D

Thanks,

~Flareboy323

EDIT: BTW its a gmail

yeee i need it to XD