I finished my 17k holy stars without appearance of at least 1 tome boss. What is that?
Labyrinth works on RNG [not exactly but still](read it up online if you don't know what it is) so anything can happen and all kind of odds are acceptable
But technically with 17k HS you should have gotten multiple boss encounters try reaching live support they might be able to help
If you want to talk regarding the game or just wanna chat Line ID :: rustyskeleton you can ADD me