Originally Posted by phob

I completed mission 29 last one had multiple attempts
not a single raid boss spawned
I think 29 is broke because I went to mission 28 and immediately got two in a row.

I experienced the same thing. I think mission 29 starts spawning a new type of raid boss. They must have not added it yet.

Edit: OH! And the Rainbow rate is 15% for anyone wondering for the last 2 rounds of the weekly deal.