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](/Actions.aspx?ID=26) checks related to these creature is increased by 2.
Bard
This indicates abilities from the bard class.
Concentrate
An action with this trait requires a degree of mental concentration and discipline.
Focus
A spell you can cast by spending a Focus Point, and that is automatically heightened to half your level rounded up.
Spellshape
Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.
source: Player Core pg. 371
spell_type: Focus
type: Spell
You add a flourish to your composition to extend its benefits. If your next action is to cast a cantrip composition with a duration of 1 round, attempt a Performance check. The DC is usually a standard-difficulty DC of a level equal to the highest-level target of your composition, but the GM can assign a different DC based on the circumstances. The effect depends on the result of your check.
Critical Success The composition lasts 4 rounds. Success The composition lasts 3 rounds. Failure The composition lasts 1 round, but you don’t spend the Focus Point for casting this spell.