A cantrip is a spell that can be cast any time, at will, without using Mana or AP.. Repeated practice has fixed the spell in the caster’s mind and infused the caster with the magic needed to produce the effect over and over.
Cantrips can be changed free of charge by performing the Spellbinder’s Ritual. Performing this Ritual must be done during a Long Rest (a sleep of at least eight hours, uninterrupted).
In Combat, only one Cantrip may be cast per Turn.