The extended rules also provide four more classes that can be chosen during the creation of the character, or sometimes as an evolution of an adventurer or dwarf: rider, druid, priest or wood elf. It introduces the aptitudes (skills) that are chances to manage definite actions (such as horseback riding or camouflage), whereas the qualities are generic indicators. The aptitudes range between 0 and 18 (and are tested with a d20 in dice notation). They have a base value (some are part of the culture, or are simple tasks). When the character reaches a new level, the player can distribute 10 points to raise the aptitudes. The base value and the cost to increase depend on the type of hero (riding is easier for a warrior than for a mage); the cost also depends on the current aptitude level.