Songbird's CallFocus 4

Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.

An aura is an emanation that continually ebbs out from you, affecting creatures within a certain radius. Aura can also refer to the magical signature of an item.

This indicates abilities from the bard class.

To cast a composition cantrip or focus spell, you use a type of Performance. If the spell requires an auditory performance, you might recite a poem, sing a song, or perform a dramatic monologue. If the spell requires a visual performance, you might dance or pantomime. You can cast only one composition spell each turn, and you can have only one active at a time. If you cast a new composition spell, any ongoing effects from your previous composition spell end immediately.

An action with this trait requires a degree of mental concentration and discipline.

Focus spells are a special type of spell attained directly from a branch of study, from a deity, or from another specific source. You can learn focus spells only through special class features or feats, rather than choosing them from a spell list. Furthermore, you cast focus spells using a special pool of Focus Points—you can't prepare a focus spell in a spell slot or use your spell slots to cast focus spells; similarly, you can't spend your Focus Points to cast spells that aren't focus spells.