Besides, there were also many Guru-level mageweaths on the crown, the most famous of which was the Magic Rebound mageweath which could completely repel magic spells that were below the Sanctuary-level. It also had extremely high defense against Sanctuary-realm magic spells.
Besides, when one was wearing the High Elven queen's crown, they would also have their mental strength increased directly by hundreds or thousands of times. At the same time, the wearer could also obtain an endless supply of mana through the eternal gemstone on the crown to dramatically increase the power of any magic spell that was cast.
To put it simply, it was the crown of kings, and anyone who wore it would possess power that was strong enough to suppress everyone. Of course, that was not absolute. Otherwise, Geresco wouldn't have been able to kill the High Elven queen in the first place.