Knight/Warden damage help

So, I have an idea for a knight that takes the warden multiclass feat in order to get the feat that adds +con damage on any attack that slows. Then I just sit in the slowing stance and rack up the damage. I vaguely recall others talking about more methods to add con to damage and was hoping that some kind souls more knowledgeable than me could help me out.

I'll take any combination at this point.

Thanks in advance.

Best way to do it is to be a half-elf, take Eldritch Strike as your dilettante power, and base it off CON, then grab Versatile Master at Paragon. If you can manage to swing Lightning damage, you also take Lyrandar Wind-rider as your PP. And Quickened Spellcasting at Epic.

But you should be aware that you aren't going to rack up to particularly significant levels of damage however many times you +CON to it, if you're only swinging once a turn.