Portentous Spell Feat 16
Source Pathfinder Advanced Player's Guide
Your spellcasting is rife with strange lights, esoteric gestures, and other captivating effects that befuddle your foes.
If the next action you use is to Cast a Spell, any creature that attempts to use a reaction triggered by your Cast a Spell activity takes a -2 circumstance penalty to attack rolls and skill checks rolled as part of the reaction.
In addition, if the spell includes a spell attack roll or requires a saving throw, creatures you hit or that fail their saves are Fascinated with you until the start of your next turn.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ManipulateYou must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
MentalA mental effect can alter the target's mind. It has no effect on an object or a mindless creature.
MetamagicActions with the metamagic trait, usually from metamagic feats, tweak the properties of your spells. You must use a metamagic action directly before Casting the Spell you want to alter. If you use any action (including free actions and reactions) other than Cast a Spell directly after, you waste the benefits of the metamagic action. Any additional effects added by a metamagic action are part of the spell's effect, not of the metamagic action itself.
OracleThis indicates abilities from the oracle class.
VisualA visual effect can affect only creatures that can see it. This applies only to visible parts of the effect, as determined by the GM.