The Spellcasting character first determines the Spell and its Drain. He then decides on any Spontaneous Modifications to the Spell, modifying the effects of the Spell and its Difficulty. The caster the performs a Spellcasting Test against the modified Difficulty. The Spellcaster is considered dual-natured for the whole duration of the Spellcasting Test. Whether or not the Spell was successfully cast, the Spellcaster now suffers the Drain specified before the test.