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Knowledge also means you know about things e.g. : knowing about weapons means it's more likely you have heard about a manufacturer or even a specific model and it's way more likely you know where to buy something

Own Tradition like in the book: Focus formula As focus Focus cost x 0.25 Ritual Spellcasting 3L 1,000¥ Spell formula Combat 3L 2,000¥ Detection 2L 500¥ Health 2L 500¥ Illusion 3L 1,000¥ Manipulation 3L 1,500¥ in other traditions +4

Positive Quality: Gain 1 lasting Edge for selected attribute. (Select the attribute at gaining the quality)

BuildCost * 3 (bei loyalty 5)

Can be a specialization on a normal weapon class if the exotic weapon is similar enough.