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Training via the trainers also has a secondary importance. With each skill trained in a particular field (such as Crafting) you also gain 1 point in that general field of knowledge. Many characters in the game will have conversation options at various points or during quests that you will need enough points in a particular field to be able to use it, such as needing 4 Charisma to unlock a new option with Sinda in the Berserker village.