Quote Originally Posted by Kril View Post
I believe you get one Ultimate Booster per solo UH PD trigger you do, unless it was by luck that I got one on my first trigger, no idea but I'll run some more later on unless someone else can confirm. dam shame Ray weapons didnt get increased drop rates

dont know if S ranking this had anything to do with it either BUT i do know that each class you S rank solo PD UH with you get 100 Hero Crests which is pretty nice
You can see the Ultimate Booster awarded in the quest results window if you get S-rank.