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.
Fortune
A fortune effect beneficially alters how you roll your dice. You can never have more than one fortune effect alter a single roll. If multiple fortune effects would apply, you have to pick which to use. If a fortune effect and a [misfortune](/Traits.aspx?ID=110) effect would apply to the same roll, the two cancel each other out, and you roll normally.
Ranger
This indicates abilities from the ranger class.
source: Player Core pg. 383
spell_type: Focus
trigger: You attempt a check to Recall Knowledge about a creature, but you haven’t rolled yet
type: Spell
You have a preternatural ability to remember details about your foes. Roll the triggering check twice and use the better result.