Haste - Target gains a second action and boosted Dodge Chance until the end of their next turn.
Type: buff - Category: Speed
See also: | 
Accelerated | 
Enlightenment | 
Haste
By strategically casting Haste on an ally, they gain an additional chance to unleash all of their devastating attacks on the opposing team. The Haste buff is triggered immediately to grant them their second action. In addition, their Dodge chance is increased (dependent on the level of the skill) to help them avoid attacks until they execute their second actions. The haste buff expires after they take their second chance.
If a room is cleared before their turn begins, then the Haste buff persists in the next room.
Rocky the Shiitake and 
High King Valkin's 
To War! (Infantry) can give haste to the entire party, while other heroes like 
Chief NubNub can haste a single ally, and heroes like 
Lady Nimriel gain haste for themselves.
Heroes
The following heroes have or can inflict/apply Haste:
Angelic Resurrection (Special Attack): Bring an ally back from the dead with a % of their HP, [Haste] and 3 [Energy].
Haste Ally (Special Attack): Grants an ally a second action on its next turn, plus an evasion buff that grants a [50.5% + 0.5%/lvl] chance to Dodge an attack until the end of its next turn.
Fanning the Flames (Trait): At 25% Pressure, allies gain 30% DEF. At 50% Pressure, allies gain 25% Damage Reduction. At 75% Pressure, allies gain 20% ATK. At 100% Pressure, allies become Hasted, Pressure drops back down to 60%. The Furnace does not lose Pressure from this.
Dwarven EMT (Special Attack): Heals or Repairs target ally, boosts the ally's Max HP and grants the ally Haste.
Goblin's Exterminator (Trait): Takes 25% less damage from Goblin enemies and deals 2x damage to Goblin enemies. When this Hero kills a Goblin, gain Haste and increased ATK.
To War! (Infantry) (Special Attack): Melee Physical attack on all enemies that grants team Haste.
Second Wind (Trait): Gains +1 energy and Haste after dealing a killing blow.
Spore Cloud (Special Attack): Grants team Haste, giving a second action and +Dodge Chance.
Adept Strikes (Trait): Allies and self gain Haste after using a single target Melee Physical attack once per round.
Impaling Barrage (Special Attack): 3 Armor-Piercing Melee Physical attacks on target enemy. If target dies, Astrid gains Haste.
Warrior's Chi (Special Attack): Heals self, then grants self and allied Assassins and Warriors DEF+ buff, +1 Energy and Haste.
Epic Heroes with Haste:
Hugin and Munin (Epic): Chance to do an attack for 2x damage, and add Haste to self and all other Dwarf allies + Epic Passive: Epic Lead By Example.