Feats

Cast the affected spell as a swift action.

Increase your spell's range by one category: touch to close to medium to long.

Creatures damaged by your spells with the cold descriptor become entangled.

A creature that fails its save takes -2 on saves against your emotion and fear effects and -1 on all its saves for 24 hours.

When you cast a single-creature summoning spell you can possess the summoned creature as magic jar with no receptacle, risking ejection and backlash damage if it is hurt.

RequiresSpell Focus (conjuration), ability to cast magic jar

The spell's path bends around obstacles to reach a chosen target and ignores cover and concealment on its attack roll.

Exclude a number of creatures up to your bonus-spell ability modifier from your instantaneous area spell.

RequiresSpellcraft 10 ranks.

A darkness-descriptor area spell also entangles creatures in the area (save negates), and you are never impeded by it.

RequiresTenebrous Spell, Umbral Spell

A creature damaged by your spell is sickened for rounds equal to the spell's original level.

Cast the affected spell without verbal components.

The first time the spell damages a creature or it fails a save, its nonmagical light sources go out and you may dispel light-descriptor spells on it as targeted dispel magic.

A light-descriptor spell dazzles creatures in its area, penalizes sunlight-vulnerable creatures on a failed Will save, and extends its own dazzle/blind durations.

Shadow conjuration and shadow evocation spells (and similar shadow-descriptor spells) are 20% more real than normal.

RequiresSpell Focus (illusion)

A fire-descriptor spell works underwater with no caster level check but requires one to function above water, with no slot cost increase.

Cast the affected spell without somatic components.

Make a Knowledge check as you cast to have the spell ignore the target's SR, DR, energy resistance or immunity, or a save bonus.

A water-descriptor spell that hits a creature also inflicts the fugue madness (or amnesia on a crit or natural 1) unless it succeeds at a Will save; the spell gains the evil descriptor.

Your spell is hard to identify and can be made to look like a different, similar spell.

RequiresBluff 5 ranks, Spellcraft 5 ranks., Bluff 5, Spellcraft 5.

+2 to the DC to dispel your spell; a dispelled or dismissed tenacious spell lingers 1d4 rounds.

Cast in darkness or dim light the spell gains +1 caster level and save DC and resists dispelling; cast in bright light it requires a concentration check.

Your spell ignores protections against death effects, negative levels, and energy drain, and can affect undead.

RequiresKnowledge (religion) 6 ranks, Spell Focus (necromancy).

An illusion (figment) spell makes one 5-foot square of the illusion threaten a target that fails to disbelieve, allowing flanking; you can move the square as a swift action.

RequiresSpell Focus (illusion), gnome

Your mind-affecting spell affects undead, even mindless undead, but not living creatures.

RequiresKnowledge (religion) 6 ranks, Spell Focus (necromancy).

A creature damaged by your spell is deafened for rounds equal to the spell's original level.