Swiftcast reduces the cast time of the next spell used to instant. Spells that are already instant cast will not consume Swiftcast. It only affects actions specifically categorized as spells, and will not work with Limit Breaks. Swiftcast is itself an instant cast off-global cooldown (oGCD) ability. This allows players to weave it between global cooldowns (GCD) after using instant cast weaponskills or spells.
Swiftcast is best used with spells with cast times longer than the 2.5s GCD. For most disciplines, the only spells that fall into this category are revive spells. As being able to provide an instant revive is an important support option, said disciplines will typically save Swiftcast for these spells. Red Mages are particularly well known for their ability to instantly revive two party members back to back by combining Swiftcast with their Dualcast trait.
Swiftcast can also be used for DPS purposes. This is particularly true for Black Mages, the only job without access to a revive spell and thus no need to hold Swiftcast in reserve. Black, Red, and Blue Mages are the only disciplines with damaging abilities that have a cast time longer than the GCD, and will get the most use out of using Swiftcast for this purpose.
If using Swiftcast on a spell with a GCD cast time, it is important to weave Swiftcast after an instant cast spell, as otherwise Swiftcast's animation will delay the next spell, pushing back the GCD and significantly limiting Swiftcast's effectiveness.
Swiftcast spells will still activate the GCD, providing an opportunity to weave other oGCD abilities between spell casts. Using Swiftcast on a spell with a GCD cast time without weaving another oGCD ability during the next GCD will have no significant effect to overall damage or healing.
Swiftcast is available only to ranged magic DPS in PvP. With PvP's greater emphasis on mobility and shorter cast times, Swiftcast is primarily used to improve mobility, allowing players to cast their stronger spells whilst on the move. To this end it has a much shorter recast time allowing players to use it fairly frequently.
Players can only set two additional actions at any given time, so they must choose actions which complement their combat strategy. Swiftcast must compete with Drain, Addle, Aetheric Burst, and Manaward for an available slot. Swiftcast is the only mobility-focused additional action available.
|A Realm Reborn||Added as a Thaumaturge and Black Mage class action learned at level 26.|
Was available as an additional action to Arcanists, Archers, Conjurers, Gladiators, Lancers, Marauders, Pugilists, Scholars, Summoners, and White Mages.
|Patch 2.4||Added as an additional action to Rogues.|
Potency of attack magic cast under the effect of Swiftcast now halved in PvP content.
|Heavensward||Added as an additional action to Astrologians.|
|Stormblood||No longer available as an additional action.|
Now learned as a role action by all healer and magic ranged DPS disciplines.
Acquired level increased to 32.
No longer available in PvP. New PvP exclusive version added. See below for its patch history.
|Shadowbringers||Acquired level reduced to 18.|
|Stormblood||Added as a Black Mage job action with a 30s recast.|
|Shadowbringers||Now an additional action available to all magic ranged DPS disciplines.|
|Patch 5.3||Recast time reduced to 15s.|