By creating a ward in the shape of a pentagram, all magic within the pentagram is weakened. The strength of the spell does not depend on the skill of the caster, but instead depends on the size of the pentagram. The larger the ward, the weaker spells and other supernatural abilities become. Interestingly, if the ward is not strong enough to affect all spells, it affects the stronger ones first, while weaker magic remains unfazed.
(Article taken from Slayers Universe.)
- ↑ Encyclopedia Slayers, pag. 235