A cantrip is a kind of minor spell. These spell do not require Mana to cast, and consequently can be used freely by spell-casters that know them. Although they are often thought of as 'weak', this is properly thought of as a description of their complexity, not their usefulness. Sufficiently powerful spell-casters with certain Classes can turn low-level spells into cantrips, becoming able to use them without mana cost. Cantrips with a lasting duration can be maintained indefinitely, but only if the spell-caster does not cast any other spell.