Magic resistance.
This was hard to attain.
Among all the known professions, the monk had the highest magic resistance. A legendary Monk had an amazing magic resistance; they could stand in the same place and let a spellcaster below level 15 use all their spells. As long as the profession level of all the spellcasters were lower than 15, it was impossible to threaten a legendary monk. In front of a legendary Monk's abnormal magic resistance, many spells wouldn't even make a dent, and the effects of elemental damages would be ignored.
This was an ability that was more powerful than all the other elemental resistance and was also resistant to all spell effects.
In certain aspects, this was why the monk could have a 'Perfect Self.'
Soran was not at all resistant to magic.
