How do I block ONE domain in my htaccess?

[7hom4s]

I've tried just about anything. Can someone here please, please help me inserting a piece of code that will get rid of traffic from besthardcore.net?
This is my htaccess file as it is now, preventing only hotlinking, but not traffic from this useless tgp or whatever it is:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?sensual-ladies.com(/)?.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?catyxxx.com(/)?.*$ [NC]
RewriteRule .*\.(gif|jpg|jpeg|bmp)$ http://www.sensual-ladies.com [R,NC]

Can someone please help me, rewriting this, so I can just upload it?
Each time I try to change it, I end up not having access to my sites, no matter from where I try to gain access. I just need this ONE single domain to get lost as soon as possible.

7hom4s