I've never played mass effect so I'm gonna need some info before I can vote.
English
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Krogans are warrior space Dinos race who grow more badass as they age, they get stronger, tougher, taller, and angrier. They live on Tunchanka, which is basically Australia times one million, as a planet. When they kill stuff, they go into a blood rage, making it very hard to kill them. They use shotguns. A lot, especially the M-300 claymore, which, before it was mass modified, would shatter a human's arm bones if they fired it. They have several hearts, and redundant immune systems, meaning multiple of everything, including the brain. They have armor plates on their foreheads, which grows harder every year they live. They can live to be over a thousand years old, and the plate will be able to stop sniper rounds. They will headbutt their enemies. Which hurts. Alot. Vanguard Krogans have biotics, including a biotic charge, which is basically having a 1000~+ lb Dino thing charge at you at extremely high speed, which locks on, and, has increased force behind it. Warlords are some of the oldest Krogans, and carry around gigantic hammers, which can be charged with biotic or electrical energy, creating more force behind the swing.
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Also, Warlord are about 12 feet tall. Or around 10 feet.