Encryption

Creates a magical language that only the spell caster and their desired targets can understand. This spell can encrypt words messages markings and even thoughts. To the caster and their desired targets, these words' writings and markings will sound/look normal, however, anyone that is, say listening in on a conversation or reading the language will not understand. Note that the user can encrypt their thoughts as well so that anyone listening to their thoughts will not understand them. Also if the user mind controls one of the caster's targets they will still not be able to understand the encryption as only the speaker themselves truly knows the language.