Capítulo 55: 55: The Royal Tomb 

Orson couldn't help but cheer. This boss had actually dropped some nice loot! It was worth using the rare artifact that had a 12-hour cooldown to survive!

A level 25 [Thieving Mage Assassin] rogue hero weapon and a level 25 [Warlord's Shoulder Armor] warrior

armor.

And then...

"Damn! It's not legendary equipment... this is... an A-Class magic book!"

Orson was astonished. A level 25 Lord-Class boss could indeed drop an A-Class magic book, but the chance was as slim as winning the lottery...

Most mages who wanted an A-Class or higher magic book, without tons of gold to burn, usually obtained them through difficult mage guild chain quests.

Some had calculated that the probability of a Lord-Class boss under level 30 dropping orange items was between 0.1% and 0.2%.

Of course, large organized guilds were the exception—these guilds had no shortage of grinders who could farm hundreds of dungeon runs.