Official Lodestone Job Guide (Always up-to-date)
Elemental Gauge
The Elemental Gauge indicates whether you are under the influence of Astral Fire (after casting a Fire spell) or Umbral Ice (after casting a Blizzard spell). While under the influence of Astral Fire, all Fire spells will have increased potency, but require more MP to cast. While under the influence of Umbral Ice, all Blizzard spells will have no cost, and will recover MP upon striking a target. Furthermore, when maintaining stacks of Astral Fire or Umbral Ice, a spell of the opposite element can be cast at no cost but will deal reduced damage.
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The action  Umbral Soul (acquired at level 35) halts the expiration of Umbral Ice. Reapplying this effect, or casting a spell of the opposite element, will cause its expiration to resume.
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Coming under the influence of Astral Fire or Umbral Ice will grant  Enochian, and set the lower-right corner of the gauge aglow, indicating its effect is active. Enochian increases the potency of magic attacks, as well as unlocks powerful spells such as  Blizzard IV. Enochian fades when Astral Fire or Umbral Ice expires.
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Casting  Freeze or Blizzard IV grants 3 Umbral Hearts which are represented by the arrows in the gauge's lower-left corner. An Umbral Heart is consumed each time a Fire spell is cast, nullifying the MP cost increase applied by the Astral Fire status.
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The Enochian bar will fill every 30 seconds the status is maintained. When the crystal at the bottom of the Elemental Gauge glows pink, you will be under effect of Polyglot, which allows the spells  Foul and  Xenoglossy (acquired at level 80) to be cast, consuming a crystal.
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Upon learning the trait  Enhanced Polyglot, you will be able to stack a second Polyglot.
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Upon learning the trait  Aspect Mastery V, the Paradox Gauge will be displayed. If your element switches to the opposite element when under the effects of either Astral Fire or Umbral Ice and in possession of the maximum number of Umbral Hearts, the left side of the Paradox Gauge will light up. You will then be able to use  Paradox.
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Simple Mode
Umbral Ice
Astral Fire
Umbral Ice Timer Halted
Enochian
Umbral Hearts
Polyglot
Paradox
Astral Fire Gauge
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Upon learning the trait  Enhanced Astral Fire, while under the effect of Astral Fire, casting  Fire IV or  Flare will grant stacks (1 and 3 respectively) of Astral Soul. At maximum stacks, you can cast  Flare Star.
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Simple Mode
Astral Soul
Umbral Soul (acquired at level 35) halts the expiration of Umbral Ice. Reapplying this effect, or casting a spell of the opposite element, will cause its expiration to resume.
Enochian, and set the lower-right corner of the gauge aglow, indicating its effect is active. Enochian increases the potency of magic attacks, as well as unlocks powerful spells such as 
Blizzard IV. Enochian fades when Astral Fire or Umbral Ice expires.
Freeze or 
Foul and 
Xenoglossy (acquired at level 80) to be cast, consuming a crystal.
Enhanced Polyglot, you will be able to stack a second Polyglot.
Aspect Mastery V, the Paradox Gauge will be displayed. If your element switches to the opposite element when under the effects of either Astral Fire or Umbral Ice and in possession of the maximum number of Umbral Hearts, the left side of the Paradox Gauge will light up. You will then be able to use 
Paradox.
Enhanced Polyglot II, you will be able to stack a third Polyglot.
Umbral Ice Timer Halted
Polyglot
Enhanced Astral Fire, while under the effect of Astral Fire, casting 
Fire IV or 
Flare will grant stacks (1 and 3 respectively) of Astral Soul. At maximum stacks, you can cast 
Flare Star.
Astral Soul