Talk:Shalltear Bloodfallen/@comment-76.218.192.169-20150913021314/@comment-26314029-20150919124255

so after checking the LN it would appear that some NPCs do know the message spell. i dont know if NPCs can be taught new spells since as you said there is no instance of that happening yet, however several of them already seem to know the message spell. Nerberal can use it since it was said she used the spell to contact Albedo in the second volume. a scroll was not mentioned nor implied. shalltear also mentioned that she didnt know the message spell, not that she didnt have a message scroll on her. on the other hand it was specified that cocytus used a scroll to contact demiurge during the lizardmen invasion arc, and it was the same for solution.

despite saying all this i think all of your points except for the player restriction are right, its most likely a spell related to a job class, and all of the people who were said to use the scroll rather than the spell were non-magic users. i think its more likely to say that since its never stated that its a player only spell, and that the author always seems to specify when a scroll is used and when one isnt, that most magic-based jobs give access to the spell (whether they learn it or not is a different issue). this would also support the harvesting scrolls theory since they still need to make the message scrolls for those who cant use it.

whether im right or not aside, i dont think its safe to assume that NPCs for sure cant learn the spell since the above mentioned points create room for some reasonable doubt in my opinion