+2 Constitution, +1 Strength

Unlike most sentient species, krogan eyes are wide-set - on Earth, this is common among prey animals, and in this case it gives the krogan 240-degree vision, giving them greater visual acuity and awareness of approaching predators. Krogan eyes have narrow pupils.

Your body is naturally acclimated to live in the harshest environments. You have advantage on Constitution saving throws to resist exhaustion due to environmental hazards such as extreme heat or cold. Additionally, you can go twice as long without food or water before you suffer exhaustion.

When you kill an enemy, you can use a bonus action to enter a mindless blood rage. Blood rage lasts for 1 minute or until you end it as a bonus action. For the duration, you must move towards and attack an enemy on your turn and you cannot concentrate on spells. While in blood rage, are immune to being charmed or frightened and you gain temporary hit points equal to your Constitution modifier at the start of each of your turns. When blood rage ends, you lose any remaining temporary hit points from blood rage.

Krogan have secondary and in some cases, tertiary organs as well as a second nervous system, allowing them to fight even after taking grievous injury. When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. You can’t use this feature again until you finish a long rest.

At an early age, the inch thick leathery skin and bony plates covering a Krogans body become tough enough to resist many injuries. When you aren't wearing armor, your Armor Class is 12 + your Constitution modifier. You can use your natural armor to determine your Armor Class if the armor you wear would leave you with a lower Armor Class. A shield's benefits apply as normal while you use your natural armor.

You gain proficiency in the Intimidation skill. You have disadvantage on all charisma ability checks, minus intimidation, when dealing with other races. You roll normally when dealing with other Krogan.

Your hit point maximum increases by 1, and it increases by 1 every time you gain a level.

You can speak, read, and write common.

You gain the following benefits: You can attack with a headbutt, which is a natural weapon that you can use to make unarmed strikes. If you hit with it, you deal 1d6 + your Strength modifier bludgeoning damage. When you use the Dash action during your turn, you can make a melee attack with your headbutt as a bonus action.