Last I recall the relic weapon is here to reward people taking time to do it
If the ground is so huge it's because it's suppose to take time to have it

And I agree the atma book are the most boring part but they are now extremely easier to achieve and cost nothing
The light part are also insanely fun because you just have to farm sastacha lv15 in 3 min again and again, then 1h later your weapon is ready XD