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Cost
Cost is a property of active skills. Most skills have a mana cost by default, though costs of life or other resources may also be possible.
The cost of a skill must be paid each time it is used. The cost of skills is spread over a short period of time as the skill is activated. Cancelling a skill mid-activation, such as with a dodge roll, will stop the remaining cost from being spent but will not refund any already spent cost.