Skill Development
Having unique skills and classes give a unique way to interact with your world for your game's players. The shortfall in many games is the recycling of the same old skills - lightning bolt, fireball, unlock door, sneak. This may be fine if you have a fantastically unique world, or if your game is entirely free, but most developers need to look into creating something more original. You can consider nearly everything your character does as a skill - in an action game the ability to aim better could be a skill, in a racing game certain abilities could be skills (like better sliding, etc).
General Skills
Lockpicking
Healing
Lockpicking
Healing
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