A THREAD FOR NEWCOMERS!

Hello everyone! Friends, I can't find the answer to this question anywhere on the internet: when a hero's luck is greater than 3 (let's say, 5), the current luck components of the monster indicate, for example, expert luck +3, lucky dove +1, lucky clover +1, spells -2. If one of the artifacts is removed, then it accordingly indicates "spells -1". The hero has not visited any pyramids or similar locations. So, I can't understand where this "spells -2" comes from, and what exactly is modifying it? I apologize in advance if this is a noob question, and thank you for your answer. P.S. Yes, I'm playing HoMM3 HD (launcher 4.100 RC9, if that's important).