Type: Metamagic
Source: Cityscape
You can make your spell effects invisible.
Prerequisite: Any metamagic feat.
Benefit: You can modify any spell you cast so that it carries no visual manifestation. All other aspects of the spell, including range, area, targets, and damage remain the same. Note that this feat has no bearing on any components required to cast the enhanced spell, so the spell's source might still be apparent, depending on the situation, despite its effects being unseen. For example, a fireball cast by someone with this feat could be made invisible in the moment of its detonation, but everyone in the area would still feel the full effect (including the heat), and any flammable materials ignited by the explosion would still burn visibly with nonmagical fire. Those with detect magic, see invisibility, or true seeing spells or effects active at the time of the casting will see whatever visual manifestations typically accompany the spell.
A spell modified using the Invisible Spell feat uses a spell slot of the spell's normal level.