maplestation_modules/code/modules/magic/mana/attunements/attunement.dm 
| /datum/attunement | The "attunement" a certain spell or piece of mana may have. When mana is consumed, it's attunements will be compared to the attunements of what consumed it, and then the result will be used to generate how much mana will be actually consumed. Matching attunements decreases cost, vice versa. |
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