Mexican flag is full of national symbolism. The green strip represents the Independence Movement. The white stripe represents the purity of the Catholic faith. The red stripe represents the Spaniards that joined in the quest for Independence and the blood of the national heroes. The emblem-shield symbolizes the Aztec heritage.
Throughout skyrim you will go to the Riften fishery and see a woman (Argonian) - No hair. She will say she might lose her job due to a Skooma addiction and needs a Cure Desease potion, once she had this a Goal will come up saying Find out the source of the Skooma.
The first step in tackling Greater Rifts is to get a Keystone of Trials. These items drop from Rift Guardians when you're playing on Torment difficulty with a max-level character. The Keystone allows you to access a Realm of Trials. This Realm acts as a sort of placement test for Greater Rifts.