This spell siphons all of the magical energy in in the area of effect. When the duration ends, the magic returns. The magically-drained emanation is fixed with relation to the planet or plane it is cast on; it cannot be cast on an object (as Light can) so that it can be moved about.
Any spell, spell-like ability, or supernatural ability triggered by someone or something in the area of effect, or that creates a non-instantaneous effect within the area, automatically fails with no saving throw or spell resistance roll allowed. However, permanent effects, previously-existing effects, or effects that are created outside the area of effect can affect targets within the area of remove magic.
Example: A druid is inside the area of a remove magic spell when a zombie attacks him. He attempts to assume the form of a bear, but his supernatural shapechanging powers are rendered useless by the lack of magic. A wizard outside the area of effect sees the druid's problem and is able to cast a volley of magic missiles at the zombie, killing it. He brings his torch with its continual flame into the affected area to check the druid for wounds, and it never even flickers. Later, the druid attempts to create a wall of thorns, but accidently tries to create part of the wall within the remove magic area, so the spell fails.
The arcane version of the spell can accept permanency (must be 13th level or higher, costs 2,500 XP). Artifacts and creatures of demigod status or higher ignore the effects of this spell. An Antimagic Field or another Remove Magic spell that overlaps the area of an existing Remove Magic spell causes no extra effect in the overlapping area.
Arcane material component: A vyord crystal with a SR of at least 25. You must overcome the gem's SR to cast the spell.