Overdrive/Umbra

Bloodhunt
Bloodhunt is exclusive to the Phoenix Frigate. When it is within an opponent's Support Field, it gains additional carrier damage, speed stats, shield bypass, as well as resistance to most damage types.

The effects last until 3 seconds after the condition is no longer satisfied.

Culling
Culling is exclusive to the Wraith Cruiser. When an enemy ship within maximum range, regardless of firing arc, loses its Shields or Ablative Armor, the ship gains bonus Ablative Recovery and the ability to apply the Weapon Disrupted effect to any enemy ship on hit, decreasing their damage output.

A very similar version is available to the Lunatic Cruiser.

Bloodlust
Bloodlust is exclusive to the Ogre Battleship. When an enemy ship within maximum range, regardless of firing arc, is destroyed, the ship gains bonus Ablative Recovery, in addition to a stacking DPS and AoE bonus. The stacks are applied additively with respect to each other, so 5 stacks equals 5 times the bonus.

A very similar version is available to the Savage Battleship.

Gorgon Gaze
Bloodlust is exclusive to the Medusa Destroyer. After the ship goes through sufficient Firing Cycles (calculated across all equipped weapons), its Driver weapons gain the ability to temporarily disable enemy walls.

Blood Scent
Blood Scent is exclusive to the Behemoth Dreadnought. When an enemy ship enters two of its weapon arcs, its weapons and squadrons deal Stasis on hit, and the ship receives additional Ablative Recovery.

The effects last until 3 seconds after the condition is no longer satisfied.

Blood Rush
Blood Rush is exclusive to the Manticore Battlecruiser and Pariah Battlecruiser. When an enemy enters both weapon arcs, the ship gains extra weapon speed and maneuverability. Its weapons also apply the Shield Disrupted effect to any enemy ship on hit, which reduces the target's shield defense by the specified percentage.

The effects last until 3 seconds after the condition is no longer satisfied.

Note that this Overdrive is not affected by any bonuses.

Hostility
Hostility is exclusive to the Hostility Augment, which can only be outfitted on the Behemoth Dreadnought. It is a weaker version of the Wraith's Culling overdrive. When an enemy ship within maximum range, regardless of firing arc, loses its Shields or Ablative Armor, the ship gains bonus Ablative Recovery and the ability to apply a minor Weapon Disrupted effect to any enemy ship on hit.

Retaliation
Retaliation is exclusive to the Gargoyle Carrier. When there are at least three enemy ships or modules within its weapon and/or hangar firing arc, an area denial weapon is activated that shoots 24 missiles evenly in all directions. Do note that each missile only does 1/24th of the nominal DPS.

A very similar version is available for the Monolith Carrier.

In both cases, the effects last until 3 seconds after the condition is no longer satisfied.

Surcease
Surcease is exclusive to the Gargoyle Carrier and Monolith Carrier. Whenever it accumulates 1,750 health damage taken (not ablative health), it emits a huge shockwave that deals no damage but prematurely ends the firing phase of enemy weapons (including those on base modules).

After 3 seconds, the overdrive can begin to be recharged.

Stalk
Stalk is exclusive to the Aerico. While it stays in a Blight Nebula Field, the ship gains various combat bonuses for a medium duration.

Rile
Rile is exclusive to the Aerico. Whenever it summons a spawned ship, it gains a refreshable stacking bonus to damage output for a medium duration.

Bloodthirst
Bloodthirst is exclusive to Tier 8 Umbra Hulls. Whenever it deals a certain amount of damage to the enemy's health (damage to squadrons does not count), it gains a refreshable stacking bonus to its damage output for a medium duration. Note, however, that each shot can only cause Bloodthirst to gain one stack, even if the damage exceeds the threshold multiple times over.

Dislocate
Dislocate is exclusive to the Valrayvn. Whenever an enemy is destroyed anywhere within the ship's maximum range (regardless of direction and minimum range), it gains a massive speed boost for a short period of time.

Incapacitate
Incapacitate is exclusive to the Leviathan Dreadnought, which grants a Stasis Dealing effect with magnitude depending on the number of enemy ships or modules within the Leviathan's firing arc. For each enemy within the firing arc, one stack of the overdrive is applied. Note that while additional stacks are lost immediately after an enemy exists the firing arc, the first stack has a duration of 5 seconds.

Onslaught
Onslaught is exclusive to the Leviathan Dreadnought. When it takes a certain amount of health damage, it fires a long-range barrage of homing missiles at an enemy for a moderate period of time. Do note that as an overdrive weapon, it is not affected by ship modifiers, including those from the Incapacitate overdrive.

Congest
Congest is exclusive to the Amarok, enabling it to disrupt enemy weapons on hit, the extent of which depending on the number of enemy ships or modules within the Amarok's firing arc. For each enemy within the firing arc, one stack of the overdrive is applied. Note that while additional stacks are lost immediately after an enemy exists the firing arc, the first stack has a duration of 4 seconds.

Scramble
Scramble is exclusive to the Wendigo, granting it a significant boost to speed and shield bypass whenever it is inside an enemy's firing arc (does not include temporary weapons and the scramble range of squadrons).

Trivia

 * When it was first released, Culling could be activated by enemy modules as well; this has been fixed in the downtime of September 2018.
 * Bloodlust originally gave an AoE boost of 20% per level; this has been changed to a constant 20% across all levels.
 * The Phoenix Frigate originally did not gain its Bloodhunt overdrive from being in enemy support fields that inflict debuffs (i.e. the Stasis Field). When the Enfeeble Field was introduced in the late August 2019 update, its behaviour was changed so that it now activates when the ship is within any enemy support field.
 * Blood Scent was the first Overdrive with six distinct levels.
 * Blood Scent takes the Behemoth's hangar arc into account, resulting in the Overdrive being activated even if enemies are only inside one of the weapon arcs, regardless of whether any squadrons are equipped.
 * A bug introduced in the late February 2019 update replaced Blood Rush's Shield Disruption duration of 5 seconds with a Stasis Duration of 5 seconds. It is unknown whether this will be fixed in the early April 2019 update.
 * Surcease also affects base modules, despite the description suggesting otherwise.
 * The Onslaught overdrive originally had a bug which allowed its projectiles to travel very far if the target dies midway. This was fixed in the late February 2020 downtime.
 * The Scramble overdrive is the first to be triggered by being in an *enemy*'s firing arc.
 * In June 2020 a bug was discovered regarding the Incapacitate overdrive that prevented it from working at all. This was fixed soon after.
 * Originally, the Onslaught overdrive was missing its Shield Bypass value in the stat block. This has been fixed in the late August 2020 update.