when do i know that im ready for first boss?

[DGDobrev]

Thanks, mate! Good luck with the bosses I suggest you hit lvl 45-50 and then have a go at them. There is no rush, nobody forces to hack the bosses very early. Besides, when you do them at a higher level, you have much better chances and you can always slap an Ancient Knowledge scroll on and reap the big XP bonus from doing a few bosses in a row (for example, Driller-Spider-Frog-Zilgadis in one go).