I bought the Chaos Knight Titan kit from ForgeWorld, as my first Knight Titan. As such...I'm obviously dedicating it to Chaos. Even painted him all up in dark greens, snot greens, and copper. Dedicated him to Nurgle, which makes him a Daemon of Nurgle (+5 Invuln save all around!) and gives him It Will Not Die (+5 to gain a hull point back). So...yeah. The rules for the Daemonizing of the original two Knight Titans is on the ForgeWorld website, and I have to say...they're alright? A bit points heavy, for sometimes little to no gain (other than the +5 invuln).
It's pretty fun though, and I really loved the look of my Plague Engine (as I call it) popping up onto the battlefield. My opponent took one look at it's grotesque visage and went "No no no no no no!" Since it had plenty of survivability, thank you Papa Nurgle, I just...blitzed it up his side spraying Avenger Gatling Cannon rounds into him. Hit his flank, pivoted and began tearing through to the otherside.
Fun times were had by me.