Once a character has earned experience they may choose to learn the skills of another class, this means they may learn the Talents from another class or classes however this becomes more difficult the further a character spreads his knowledge.
To learn a Talent from another class the character must spend 3 months down time and a cumulative Perk cost for each Talent learned. The first Talent costs 5 Perk Points and takes 3 months; each additional Talent requires further Perk Point cost at 5 times the number of talents learned and a further 3 months of downtime. For example to learn Talents from another class 1 Talent costs 5 Perk Points, the 2nd talent would cost 10 Perk Points, the 3rd 15 Perk Points and so on.
To learn the talents from yet a another class would cost double that of the secondary, for example if the Mage takes a single Warrior Talent at the 5 PP cost then if he takes the Rogue Talent (a 3rd class) of evasion it would cost double at 20 PP
Spells if the character base class did not cast spells and he then if he learns spellcasting from Mage it cost 2 PP per spell to learn; plus 1 week of down time.