|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 Juice replenishes at the start of a new turn. It is possible that sleep aids a Caster in performing actual spells.Erf-b1-p084
It's possible for a caster to amass several "turns's worth" of juice – Vanna's turn-ending spell costed that much.Erf-b2-p022 The mechanics of this is not fully clear though, it's possible that the full reserve of caster's juice is simply larger than the amount that gets replenished, but also this example could have been possible due to extra mechanics of the Arkendish link.
Juice is (or can be) bound to Grandiocosmic Strings. Because of that, in some cases a Thinkamancer can use juice present on their string (a string they are connected with) from another source (such as another caster or a tower). Erf-b3-p179
Prisoners have their juice reserve paused – they are unable to use it while being imprisoned, but get to use it once repatriated.Hvs.tCF 202 The start-of-turn replenish doesn't happen while they are imprisoned.
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. Perhaps, like the Juice spent to replace Motion in Croakamancy spells, this extra juice is spent to put the spell in stasis.
Juice costs for pinky swears and silent orders implies that all units have a juice stat that they are simply not conscious of.