Personal Realm is a type of technique used by martial artists and sword users to greatly enhance their concentration and sharpen their sensory abilities: both the physical senses and the sense relating to sensing magic power.
To perform this technique, the user emits multiple Magic Signals from their body. Instead of letting the Magic Signals roam free, the user contains it in a small field around them. This causes the signals become a lot more sensitive. When something or someone enters the field of magic signals, the signals immediately alert the user to their precise location as well as any movements they might make. This technique makes it a lot easier for the user to block out all distractions and only focus on the things inside the field, allowing them to hit their target with techniques or spells regardless of how small the target is.