Priests of Sigmar are granted exceptional powers by their divine patron which they can wield to smite their foes in battle. Warrior Priests know the three Battle Prayers listed below.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Battle Prayers are innate bound spells (power level 3). Battle Prayers are augment spells that target the Warrior Priest and his unit.
Hammer of Sigmar: The Warrior Priest and his unit reroll all failed To Wound rolls in close combat until the start of the next friendly Magic phase.
Shield of Faith: The Warrior Priest and his unit gain a Ward Save (5+) against all Wounds inflicted in close combat until the start of the next friendly Magic phase.
Soulfire: The Warrior Priest and his unit gain the Magical and Flaming Attacks special rule until the start of the next friendly Magic phase. In addition, when cast, all enemy models in base contact with the Warrior Priest suffer a Strength 4 hit. Models with the Daemonic, Undead or Vampiric special rules in base contact suffer a Strength 5 hit instead, which Ignores Armour Saves.