Your mastery in the magic arts lets you make slight modifications to the spells that you cast.
When you cast a spell, you can slightly modify its effect in one way or another. The modification may, for instance, change the shape of the spell (make a hole in the Wall of Force), limit its area, variate the affected material (use Passwall on ice walls) or used sense (change Arcane Eye to Arcane Ear) or anchor the spell (cast Silence on an object, like Light or Darkness). To do so, you must describe the modification and make the Arcana skill check. The DC can be no lower than 10 + 2 * Spell Level. If the modification is complicated, the DM might decide to increase the DC. If you fail the check, the spell can either fail completely, be cast without the modification or bring upon a totally unexpected result. The DM decides what happens.
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