Weapons in Soulframe are grouped by "[[l:arts:Combat Arts]]", corresponding to a broad weapon archetype. Each Art has its own unique skill tree that applies to all weapons in its category. Levels gained with a weapon will unlock up to 5 perk points for its respective Art.
Maxing out Sollos-I will net 5 perk points for the Longsword Art, one every 6 levels. All enabled perks in the Longsword Art will also apply to Vetch and Igne Mora.