When cast, a single bolt of lightning will be drawn upon from overcast rain clouds, striking a selected enemy target located a considerable distance from its caster. The long range that this tome possesses is essentially offset by its inability to allow its user to attack at close range, leaving him/her vulnerable to enemy assaults. This is further made worse by the fact that the tome is one that is rather heavy, which not just impedes the user's ability to perform double attacks, but also reduces his/her Attack Speed by a significant amount. An exception of this is in Fire Emblem: The Binding Blade, where its weight is a mere 10, so it can be doubled rather easily.
In Blazing Blade and onward, the tome gained even more range, now striking foes from 3-10 spaces away, but removing the user's ability to counterattack from the standard 1-2 range and is either too heavy or given the hard caveat of being completely unable to perform a follow-up attack.