Every character has their own means of filling the Talent Gauge. With a Talent Boost gem, every character can use Auto Attacks to fill their Talent Gauge, but this will come at the cost of Auto Attack damage. If a character performs a Double Attack, their Talent Gauge will fill with each hit. Talent Gauges are not susceptible to the effects of Arts Seal. Haste Gems and Double Attack gems are often used to expedite the process of filling a character's Talent Gauge by speeding up their Auto-Attack rate. A character's aggro gain should be considered when doing this, however.