As stated in the topic, these are tedious and extremely RNG dependant.
First you have to get the mission and second you have to complete the secondary objective with all books. This is further broken by items clearly not spawning or spawning under the map surface.
It would be nowhere near as frustrating if Grims and Tomes worked like they did in Vermintide 2 , where they were always in there and it was a choice of whether or not to do it.
There’s 2 forms of RNG you relying on to be able to complete this mission, and you need to get it multiple times.
I get that at this point its too late to change that design decision, but they could easily set it that there’s always a secondary objective.
