Raum's body was immortal, but his mind wasn't immune to the ravages of time.
Without his magical discoveries fueling his ego, the weight of his actions slowly drove him insane. After the 30,000th year, most entries were unreadable. After the 35,000th year, there were no entries.
Just the scribbling of a madman who slammed and dragged a quill across the pages, believing that somehow it would record his feelings and thoughts.
Things changed with the advent of King Valeron the first.
"Year 39,093 Day 258
"I have no idea what illness drove my hand as I wrote my journals before this day, and I'm too happy to care about such trifling matters. Today I found the solution to all my problems, and not through my endless toils and readings.
"It was served to me on a silver platter.