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.
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.
Hex
A hex is a spell caused by your patron’s direct attention and intervention. Your patron does not take well to being disturbed repeatedly, so you can cast only one spell that has the hex trait each turn; attempts to use a second automatically fail and usually cause your familiar to hiss in displeasure as your patron rejects your call.
Witch
This trait indicates abilities from the witch class.
source: Player Core pg. 384
spell_type: Focus
type: Spell
With a quick burst of laughter, you prolong a magical effect you created. You Sustain a spell.