It would seem that this weapon skills critical activation is based on using it while your Tactical Points are an ODD number value (i.e. 103%) While this is just a theory, it has rarely let me down. User: Ulnan of sandoria
Levels
Vorpal Blade is only natively available to Paladins, Blue Mages, Warriors, and Dark Knights. While other jobs can obtain the required 200 Sword skill, they must use one of the aforementioned jobs as their support job in order to gain access to Vorpal Blade.
Sword skill level 200 is obtainable by the following jobs at these corresponding levels: