Ka'zilth is told to be very "evil" at times.
He is responsible for numerous terrorist activities in all houses, he is a serial killer taking pleasure from it, he is merciless, he is sadistic; torturing his prisoners its his favorite hobby, he likes terrorizing its victims, he steals from the rich and gives to himself, he loves to steal Rorry's kills.
Heck its got so many blue msg's It will take me 1 hour to find them all and post here.
here is its story I was too busy to finish. http://discoverygc.com/forums/index.php?showtopic=98264
I can't find all my blue msg's but you can find some here: http://discoverygc.com/forums/index.php?showtopic=98970
And here(you may find some from above but mleh): http://imageshack.us/g/688/screen1ct.png/