In the single-player campaign, the high templar is one of three psionic warriors the player may use, the others being the dark archon and the ascendant. In the campaign, the high templar's psionic storm used by the players units does not damage allied units, only enemies, enemy units use the default multiplayer effect. Once chosen at the war council they have the passive ability plasma surge, which causes psionic storm to restore shields to allied units in the area of effect. This makes the high templar more effective than ever, able to attack enemies and heal allies with the same ability. However, their prowess should be weighed against the ascendant, which has a powerful ability to restores its own energy and damaging abilities comparable to Psionic Storm. They now have a regular attack, "Psi Blast", which deals 9 damage per shot and has a range of 7.
High templars will gain a "psi blast" attack in an upcoming patch, similar to the attack of the same name that Tassadar possessed in StarCraft. This is designed to make high templars easier to use, as they will no longer drift into enemies when directed via an attack command.