No one really knows why these crystals function the way they do or the full extent of their power, but if a caster channels enough arcane energy the crystal can serve as an arcane conduit. When you attune to this item, you gain a spell slot equal to your proficiency bonus (i.e a +2 means you have one 2nd level spell or 2 1st level spells etc) that you can use for certain spell schools. The list is as follows:
Black- Necromancy or Illusion
Blue- Divination or Enchantment
Green- Conjuration or Transmutation
Red- Evocation or Conjuration
White- Abjuration or Evocation
Once the Spark is used it can not be used again until you finish a long rest. If you would like to combine another spark, the caster must succeed on a DC 15 Arcana check or the spark is destroyed. If the caster is successful the spark can hold an additional spell school (i.e. a red spark mixed with a blue spark can hold any combination of divination, enchantment, evocation, or conjuration spells), however a spark can only hold two different colors at a time.
Notes: by a Druid, Sorcerer, Warlock, or Wizard
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