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Spell Casting Mastery 3 (SCM3 for short) works by decreasing the overall cost of all spells by 10% of their base. It stacks linearly with all forms of mana preservation.
For Example:
Firebolt of Tallon costs 500 mana to cast. SCM3 reduces the mana cost by 50 mana. If you're specialized in Evocation, you save 55 mana due to specialization. If you're wearing a Jolum's Brilliant Bauble, you also randomly save 1 to 15% of the mana cost of the spell (5 to 75 mana).
500 mana - 11% - 10% - 1 to 15% = 500 mana - 22 to 36%
or
500 mana - 50 mana - 55 mana - 5 to 75 mana = 500 mana - 110 to 180 mana = 320 to 390 mana = average 355 mana.
You still need to have 500 mana in your current mana pool to cast the spell, but you will only use an average 355 mana, in this example.
The beauty of SCM is that it works on ALL spells, regardless of the spell type (Evocation, Conjuration, etc).
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