Psionic Speed is the ability to channel psionic energy into the body, increasing the user's speed and reflexes. Some ghosts, such as Nova, are able to use this ability, though they require a hostile environment suit to do so.
With special training, zealots can dramatically increase their speed, to the point that they may briefly transform into energy. Zealots use this ability to quickly approach opponents, spending less time being exposed to ranged attacks.
Centurions possess a similar ability named shadow charge, that allows them to cloak while charging and phase through enemies. This in tandem with their darkcoil abilities allows them to charge and stun enemy lines.
Tassadar, Zeratul, and the Queen of Blades are/were able to use a similar ability in the midst of combat.Alarak possesses a variation of this ability named Deadly Charge which releases a psionic burst of energy upon reaching his target, dealing heavy damage to it.
The zealot charges towards a target enemy unit or structure, boosting its speed to 8.47 for the duration. The zealot must have clear ground pathing to their target to reach it. Also increases the zealot's normal movement speed to 3.85.
In Legacy of the Void, Charge deals 8 damage on impact.
Artanis has a blade dash ability in Heroes of the Storm, using his psionic speed to dash forward. This ability can be augmented with the talent "zealot charge," a reference to the zealot's psionic speed ability.
Zeratul has a level 10 heroic ability call "shadow assault". When activated, he uses his psionic speed to charge forward and increase his attack speed.
Deadly charge is available as a level 10 heroic ability for Alarak in the game.