You're flavor text for the Omake Rewards had me tossing that line in there... Also, yeah I figured since we're going to be headed at Daemon worlds and such, we're going to have that somber mentality, because we'll be seeing people who have fallen. Out of fear, out of greed, out of desire, out of anything, and those who were forced to fall by others. Our Marines will be seeing some shit.
As you know our people have taken to carving the names of our fallen into their armor, well Baldur will do that. But the title points out a step beyond that, alongside that Invisitext. Baldur will be recording what happens, and such, but also promoting the "remember them as they were, not how they are bit". The Chronicles are written by him during spare time, and such. The invisible text are his actual thoughts, rather then records which the Chronicles will be.