War Assets/Krogan

The krogan clans have agreed to throw their considerable might against the Reapers. Their shock troops are aggressive, relentless, and recklessly brave.

Urdnot Wreav

Requires: Killing Wrex on Virmire in Mass Effect.
Military Strength: 25

Wreav, the leader of Clan Urdnot, has used the release of a genophage cure to seize control of Tuchanka's armies. The krogan allied with Commander Shepard to oppose the Reapers, but Wreav's plans extend far beyond the current war. With centuries of life ahead, Wreav has bluntly stated his desire to see a new krogan empire expand after the Reapers are destroyed.

Urdnot Wrex

Requires: Not killing him on Virmire in Mass Effect.
Military Strength: 30

Urdnot Wrex fought alongside Commander Shepard during the Reapers' first invasion attempt in 2183. Afterwards, he returned to Tuchanka and spent the following years rising to the leadership of his clan, championing progressive methods meant to strengthen the krogan as a whole. Conservative elements were unhappy, but news of a successfully cured genophage has solidly united all of Tuchanka under Wrex's command. Hailed not only as a great warrior but a savior, the krogan will follow Urdnot Wrex into the maws of the Reapers themselves.

UPDATED (if genophage cure is sabotaged and Wrex rules Clan Urdnot)
Military Strength: -30

After discovering that the cure for the genophage was sabotaged, Urdnot Wrex angrily ordered the krogan to withdraw support from Shepard's forces. Tuchanka's clans have hunkered down on their homeworld, determined to defend themselves while watching the rest of the galaxy burn.

Grunt

Requires: Grunt's survival during the Suicide Mission in Mass Effect 2 and in Attican Traverse: Krogan Team
Military Strength: 25

"The perfect krogan" was thrown into the world without a past, a name, or a cause. After destroying the Collectors with Commander Shepard, Grunt returned to Tuchanka to learn what it meant to be krogan. After countless arguments and brawls, the clans have granted Grunt a modicum of acceptance. Tough, wary, and cunning, the young krogan knows this experience will pay off now that it's time to fight the Reapers' forces.

Aralakh Company

Requires: The completion of Attican Traverse: Krogan Team mission
Military Strength: 25

Ancient Tuchankan legends claim that the Aralakh Wastes, named after the system's star, are where the first warrior died in battle. Aralakh Company is made up of krogan from all over Tuchanka, each chosen for their strength, ferocity, and fighting experience. No krogan community would dream of sending anything less than its finest warriors to represent their clan. The honor of who's to be chosen for the company has started more than one brawl.

UPDATED (If Grunt survived the Suicide Mission)
Military Strength: 25

Aralakh Company is led by Grunt, a genetically engineered "perfect soldier" who fought the Collectors with Commander Shepard. While young, the krogan has survived such brutal battles that the older warriors of the group have begrudgingly accepted his command.

UPDATED (If Grunt's loyalty was gained)
Military Strength: 25

Grunt was appointed representative of Clan Urdnot in addition to becoming head of Aralakh Company, a political appointment not lost on the other clans. Grunt sees this new position as the first large victory he has won on his own--the respect of his people is difficult to come by.

UPDATED (If the rachni breeder or queen is saved during Attican Traverse: Krogan Team)
Military Strength: -25

Wave after wave of rachni overwhelmed the Aralakh Company on Utukku. While fighting an impressive enemy to the death is considered an honorable end for a krogan, Aralakh Company has effectively been wiped out.

Krogan First Division

Requires: The completion of N7: Cerberus Attack mission
Military Strength: 50

The krogan First Division is a conglomeration of infantry and vehicles hastily organized into a single coalition force. The chain of command is divided by clan, with representatives from each serving as officers. Despite ancient differences, fighting the Reapers together is building a spirit of camaraderie among the division's warriors. Krogan from different clans are starting to swap equipment, stories and even the occasional barrel of ryncol.

Krogan Clans

Military Strength: 300

Centuries of krogan infighting abruptly halted with the news of a cure for the genophage. With their future restored, Tuchanka's clans have united in a show of force not seen since the Rachni War. The clans have also been stockpiling weapons of mass destruction for decades. Thankfully, their full destructive force can now be turned on the Reapers instead of Tuchanka. Their strength, size, and regenerative powers make the krogan ideal shock troops.

UPDATED (If Paragon option picked during interview with Allers after Priority: Tuchanka)
Military Strength: 5

Commander Shepard's interview with Diana Allers about bringing the krogan into the Reaper War cast the krogan in a favorable light, which drew even more of the clans to the allied forces' banner.

UPDATED (if the Citadel: Kakliosaur Fossil mission is completed)
Military Strength: 40

Fierce, toxin-immune creatures known as kakliosaurs, once used as battle-mounts by the krogan, have been cloned from the fossilized kakliosaur skull discovered by Commander Shepard.

UPDATED (if Maelon's data in Mass Effect 2 was destroyed, causing Eve to later die of complications resulting from a cure based on incomplete data)
Military Strength: -50

With the death of Eve, the Clan Urdnot shaman who provided the basis for a genophage cure, several of the krogan clans have fallen into conflict over who was responsible for her death. The fighting, an excuse for many to act on long-standing feuds, has significantly weakened krogan forces.

UPDATED (if Tuchanka: Bomb was not completed)
Military Strength: -250

The explosion that rocked the Kelphic Valley killed every living creature within a 500-kilometer radius of the hidden bomb. All of the krogan clans gathering in the valley--which included males, females, and the rare krogan children--were wiped out in the blast.

Clan Urdnot

Requires: Completion of Priority: Tuchanka
Military Strength: 300

Clan Urdnot has become the unofficial, but uncontested, representative body of krogan power to the rest of the galaxy. Within the past decade, Urdnot's warriors have either absorbed or wiped out Clans Nakmor, Jurdon, Quash and even the legendarily ferocious Clan Raik. The discovery of a fertile Urdnot female rallied even more krogan, regardless of affiliation, to Urdnot's banner.

UPDATED (if genophage cure is sabotaged and Wrex rules Clan Urdnot)
Military Strength: -300

After discovering that the cure for the genophage was sabotaged, Urdnot Wrex angrily ordered the krogan to withdraw support from Shepard's forces. Tuchanka's clans have hunkered down on their homeworld, determined to defend themselves while watching the rest of the galaxy burn.

Krogan Mercenaries

Requires: Urdnot Wrex as Urdnot leader instead of Wreav, choosing to cure the genophage in Priority: Tuchanka
Military Strength: 75

Many krogan went fortune-seeking out in the lawless Terminus systems. Their imposing bulk and infamous brutality won them prized positions as bodyguards and mercenaries. When news of a genophage cure spread, these drifters were contacted by their clans and urged to join Shepard's forces against the Reapers. After centuries of aimless brawls and bleak futures, krogan everywhere are heeding the call.