Thank you for replying to this concern, it does help alleviate some of the fears that I've had. Especially when looking at and comparing it to all of the methods to increase spell DC. The one thing that I do have a concern over is that if this is not proliferated onto a number of solid items for Assassin's then they'll feel forced to take one or two items at various different levels just to get the assassinate DC and have no other real options for equipment in those slots. That's the only reason it's nice to have the DCs baked into other options that we were going to get anyway.