Charisma

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Higher Charisma allows you to buy and sell items in shops for better prices.

Drinking Ommel Tears increases charisma and perception.

Science Talking with Richel Decos the Imperialist may slightly increase Charisma.

Items

Wearing a helmet of attractivity will increase charisma, with each +1 bonus in AV also resulting in a +1 bonus to charisma