|Natural Magic, Caster, Caster link, Juice, Scroll, Magic Item, Spell, Grandiocosmic Strings, Channels, Nodes, Dictums|
Caster proficiency: Novice – Adept – Master
A Caster can only spend a limited amount of this energy to cast spells on one turn.Erf-b1-p090 Apparently the juice replenishes at the start of new turn. It is possible that sleep either temporarily increases the limit of the juice or helps replenish higher amount of juice.Erf-b1-p084
A caster may have a maximum juice limit excess of several turns' worth, or to put it differently, one night's rest may only replenish a fraction of their maximum juice, rather than all of it.
Scrolls are a way to "store" juice for later use as casting scrolls do not seem to spend Caster's own juice.Erf-b1-p125, Erf-b1-p129 Casters create scrolls on their turn, for a significantly higher cost in juice than simply casting the same spell.