Covenant

• Harrow breaks free of his shackles in a whirlwind of impenetrable energy, imbuing himself and allies inside his Affinity Range with complete invulnerability to damage and Status Effect immunity for 3 / 4 / 5 / 6 seconds. While invulnerable, any enemy damage prevented by all affected players during this time accumulates into a total pool.
  • Invulnerability duration is affected by Ability Duration.
  • Affinity Range is not affected by Ability Range but is affected by the Mending Unity passive in the Vazarin focus school, and can be temporarily increased with Fosfors.
  • Status effect immunity also protects against knockdown and stagger.
• After the invulnerability phase, all affected players receive the Retaliation buff which provides an additive weapon critical chance bonus lasting for 6 / 8 / 10 / 12 seconds. Retaliation provides a 5% base critical chance, plus extra critical chance converted from total damage prevented at a rate of 1.50% per 100 damage points prevented. Additionally, the combined critical chance percentage is multiplied by 4 on headshot hits.
  • Retaliation duration is affected by Ability Duration.
  • Base critical chance and extra critical chance percentages are affected by Ability Strength, while damage points prevented and headshot multiplier are not.
    • Retaliation's critical chance is capped at 50% on bodyshot hits and 200% on headshot hits.
    • The critical chance applied to the weapons appears to be a flat value.
    • Critical chance seems to also be applied to melee weapons, weapon deployables ( Zenistar disc, Orvius channel throw, etc.), and Exalted weapons ( Excalibur's Exalted Blade, Ivara's Artemis Bow, etc.)
• Protection and Retaliation buffs affect both players and their Companions.
• Covenant cannot be recast while its buffs are active.
  • Multiple Harrows can cast Covenant independently of other players' active invulnerability and critical chance buffs.
• Casting animation of 3 seconds is affected by casting speed, from mods such as  Natural Talent and  Speed Drift. Casting Covenant stops Harrow's movement and actions.
• During the invulnerability phase, the current total of damage prevented is displayed to the right of the aiming reticle, represented by a shield-like emblem.
  • After the invulnerability phase, the critical chance bonus and its headshot multiplied percentage are briefly displayed at the same position, represented by a bullet-like emblem.
  • An audible whispering sound plays when each buff's duration ends.
• Covenant's buff icons for invulnerability and critical chance are displayed beside the shield and health indicators, with the critical chance bonus percentage located at the top-right of the icon and buff timers at the bottom.
• Harrow and affected allies are visibly surrounded by a gust of energy while under Covenant's effects. This visual effect expands or contracts depending on the phases of the ability, and is affected by Harrow's chosen Warframe energy color.

Main article: Lasting Covenant

Lasting Covenant is a Warframe Augment Mod for Harrow that increases Covenant's critical chance buff duration each time an enemy is killed with a headshot.

• It synergizes well with abilities that buff critical damage, such as Electric Shield and Sonar.
• Also pairs well with the Dual Toxocyst since they are at their optimal power when you are getting headshots.
• Since the critical chance applied appears to be additive, this ability can turn a Nukor modded with  Primed Target Cracker (and possibly other critical damage mods such as a Riven) into a viable critical secondary.
• Casting this while attempting to revive a teammate makes for a reliable survival strategy, as the invulnerability phase will protect you from enemy fire.
• If the mission has Environmental Hazards, like the toxic waste in the Grineer Shipyard tileset, you can use them to stack extra damage negation during the invulnerability phase.
• Covenant synergizes well with a Kitgun equipped with Pax Seeker, with its projectiles gain benefits for critical chance to headshot from this ability.
  • However, headshot kills by Pax Seeker's projectiles won't trigger  Lasting Covenant augmentation.