Fetchling Unchained Rogue / Urban Bloodrager Shadow Bloodline

[The Kwisatz Haderach]

Thinking about a build for my next campaign, and I wanted to make sure it would work the way I want it to. The idea here is 3 levels of Unchained Rogue, followed by 4 levels of Urban Bloodrager, and then into Duelist. I would be playing a Fetchling which gets the benefits of total concealment when in Dim Light. So when I hit level 7 and enter my Bloodrage, I will lower the light around me by 1 step. Normal light becomes Dim, I have full concealment from Shadow Blending, and will be able to Sneak Attack my opponents. With a starting Dex of 20 after Racial modifier, the +4 from the Urban Bloodrage, and my +4 item I will likely have, that will be a +16/+11 1d6+10 15-20/x2 with my Rapier assuming it’s a +1 Keen Rapier and a 19 AC before feats and Buckler, and a 50% chance for opponents to miss me. Have I factored all that out right?

[Troy Bacon]

Looking at it is seems your math is right to me. Not seeing how you are dimming the light...not really familiar with this build set but looking at the classes I see 99% of what you are saying just not that dimming of the light.

[Rajnish Umbra, Shadow Caller]

The Kwisatz Haderach wrote:

I would be playing a Fetchling which gets the benefits of total concealment when in Dim Light. So when I hit level 7 and enter my Bloodrage, I will lower the light around me by 1 step. Normal light becomes Dim, I have full concealment from Shadow Blending, and will be able to Sneak Attack my opponents.

No.

Shadow Blending (Su): Attacks against a fetchling in dim light have a 50% miss chance instead of the normal 20% miss chance. This ability does not grant total concealment; it just increases the miss chance.

Shadow blending does not allow you to to make sneak attacks. It's not proper total concealment.