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To have Quickness is to be twice as fast as your peers, in more ways than one:
These perks come alongside a +2 boost to Attack (ATT) and Defense (DEF), the former of which is quite rare.
Quickness is a Water Buff:
Temporary Quickness is generally preferred over permanent Quickness, due to the doubled rate of Aging. Quickness also doesn't boost the rate of Spellcasting - boosting that requires specially-made Items.
This is NOT Swiftness, which is similar but only affects running speed. On the other hand, these stack.