Viissaus is a type of metal that gains strength each generation it remains in a family.

Basic: bonds with the bloodline
2nd generation: bears the first wielder's prowess to the second generation
3rd generation: bears first generation's prowess and second generation's strength
4th generation: first gen prowess, second gen strength, third gen athleticism
5th generation: first gen prowess, second gen strength, third gen athleticism, fourth gen awareness
6th generation: first gen prowess, second gen strength, third gen athleticism, fourth gen awareness, fifth gen rogue
7th generation: first gen prowess, second gen strength, third gen athleticism, fourth gen awareness, fifth gen rogue, sixth gen will power
8th generation: first gen prowess, second gen strength, third gen athleticism, fourth gen awareness, fifth gen rogue, sixth gen will power, seventh generation supernatural skills
9th generation: first gen prowess, second gen strength, third gen athleticism, fourth gen awareness, fifth gen rogue, sixth gen will power, seventh generation supernatural skills, eighth generation mundane skills
10th generation: entire bloodline unlocked