The Dorians were a warrior culture because that they do not have very many artists or scientists. Their only major technological advance was the iron slashing sword which was what gave them the advantage to be able to take over.
the dorians
The Dorians came to Greece and took over.
Dorians from the North overran Greece
The Aeolians and the Dorians revived the trade of ancient Greece by bringing forth the agriculture of grapes and olives.
In about 1100 BC, a people called the Dorians invaded from the north and spread down the west coast.
the alphabet changed, the Dorians moved south. People began to farm again and to produce food. So in other words trade revived. One benefit was a new way of writing. and that's what changes occurred in the dark ages. Dorians had to settle in Peloponnesus
There were no Dark Ages in the Catholic Church, and as of the late 20th century, secular historians have come to recognize that there really was no Dark Age, and that this label was just one of ignorance of earlier historians. You will need to reword your question.
The main cause of the Dark Ages was the Mycenaeans being conquered by the Dorians.
Yes Greece does get dark.
The Dorians conquered the Mycenaens because they had iron weapons and their swords were stronger. When the Dorians conquered the Myceaneans the Dark ages began.
There is a blank page in Greece between 1200 and 1050 BCE between the fading Mycenaean civilisation and the beginning of Doric cultural traces. So whether the Dorians directly replaced the Mycenaeans is unknown. Or was ther some other invader who destroyed the Mycenaean culture and the Dorians moved in later. We don't really know, and little concrete evidence emerged from these dark ages for another three centuries.
It was taken over by peoples moving in from the north (Dorians) and east (Sea peoples).