During the character creation process, you'll choose a class. A character's class represents their unique capabilities in regards to executing dangerous tasks and missions. The three classes provided in this ruleset are Mage, Specialist, and Warrior.
Each class provides a number of starting abilities. Starting abilities include the name of the class in the ability's name row. However, player characters can gain additional abilities from their class. Whenever a PC would gain a class ability, they must choose an ability matching their class that has a level number equal to or less than their character level. Starting abilities may not be selected in this way.
For example, when a Warrior character reaches level 2, they gain a class ability. For this selection, they may choose any ability that is marked as "Warrior 1" or "Warrior 2", but they may not choose an ability that only says "Warrior", since those are starting abilities.