What are ten features of the Dark Ages?

The Dark Ages are also known as the Middle Ages; the term "Dark Ages" is seen as somewhat pejorative in that it implies a time of barbarity and intellectual darkness. The period extends from roughly the 5th century (the Fall of Rome) through the 14th century (the birth of the Renaissance) and usually refers to life in Europe and Asia during that time. It is also known by historians and scholars as the "medieval period" because the term "middle" implies a somewhat short period of time, or one that is somehow less significant than the two periods surrounding it. 

The Middle Ages saw a number of social movements, some positive and some negative. The Age of Chivalry occurred during this time, and was associated with a code of integrity and ethical behavior followed by knights. Knights were warriors who fought in the Crusades (holy expeditions ordered by the Catholic Church that were designed to preserve Christian dominance). They also helped protect various dynasties and communities from harm, often under the orders of a monarch or military leader. Many invasions and battles also took place during this time, including the Battle of Hastings in 1066.

The latter part of the Middle Ages (middle of the 14th century) saw a horrific disease known as "The Black Death" (the bubonic plague) spread far and wide through Europe and kill over 20 million people due to its high rate of contagion and high instance of mortality. Because of a general lack of medical knowledge or hygiene, the disease was believed by some to be linked to superstitious religious beliefs in the devil and witchcraft. These beliefs persisted well into the 18th century in Europe and the Americas. The Catholic Church became very powerful and influential during this period, partly as a result of the Crusades (begun in the 11th century) and the charges of heresy (which meant rejecting the teachings of the Church) the Church made, which were also associated with witchcraft and the occult.

It sounds as though your question is pertaining to a specific list of features you were asked to memorize. There are many different features particular to this time period, so I hope I have illuminated some of them for you.