In Aperita Arcana for Monsters & Magic, we have detailed rules for mixed blood characters on page 88. There are, however, a few races that cannot benefit from these rules due to their inherent physiology. They are:

• Faun
• Kitsune
• Lamiae
• Nymphs
• Tanuki
• Yisisir

Usually, a Mosi character will also conform to these rules, with one exception – if the player takes an appropriate background trait at character creation detailing why their character was not fully converted over by a yggmýrr, they may take traits and advancements from another race.