Tuchanka

Tuchanka is the irradiated, poisonous and highly dangerous homeworld of the Krogans. Its atmosphere was devastated in a war that occured there and the cities and plains of the plant are now choked in a horrendous cloud of toxic ash. The wildlife on Tuchanka is legendary for being some of the most aggressive in the Galaxy, second only in the universe to Felucia. It's horrible atmosphere renders it a Dangerous-Level planet, and is generally avoided, apart from by big game hunters.