so i can blow them without fear of farm all again? 

These bosses are camped all the time, you Go to be lucky of see it lol

Chainsword of Cold its the best, collapsed one's second, wind axe for lvl I think

When you say hidden, you mean hidden in the map or you need detect?
Im interessed at least in the name of the npc of the incomplete book 

A while ago I set out to get this comic that was on the official website at the live.
These are all the pages that I could rescue, the download link I leave below.

https://www.mediafire.com/file/99xf7yfp3wejjof/Lineage_Comic.rar/file