The Second Era ended in huge wars.

Most civilisation having been bestroyed this is a time of barbarism.
Most of the books and other forms of written records are lost, thus much information from older times is legend The island of Derimir is saved most of the ravages, because of its guardians and lack of cities, so the locals live in their small communities.
Period of moose: Noma is founded and is the only real town south of Skydome, rest being small villages, with the elven village of Helsin-gé being the second prominent feature.

Slowly some people start to rebuild civilisation.
period of Beaver: 3rd year R'leyh is founded and quickly gains prominence in the islands.
The arcane academy is founded on Derimir, being globally one of the first new magic academies that anyone dared to build after the mage wars. All of the early academies are built in remote places like that, as most people are suspicious of mages.

Period of beaver: Skydome is rebuilt after being destroyed in the mage wars, but the dragons have turned isolationist, the eigth tribes of dragons all feel that much of the bad things for dragons in mage wars could have been avoided, if they had not interfered in the global powerplays.

Period of wolf: First mentions of Krao
Strong pirate raids start to affect the life on Derimir.
Period of destruction:
Great evil forces descend on the island of Derimir and surrounding islands. The last guardians are all killed by the evil forces.
1st year R'lyeh is placed in a timelock
2st year Razing of Noma leaves the town a shell of its former self, it has not regained its prominence since.
3th year The arcane academy on Derimir evacuates, closing the planar link to Denimir and opening it on Fegee a small atoll in middle of nothing.
5th year The Razing of the wood-elven village of Helsin-gé(In what is now known as Greywoods) and Castle Danara causes the previously thriving elven population to be scattered.

Period of Deer: First Mentions of the Storm Goddess.
Period of the beaver: The City of Cerea is founded and quickly gains prominence on the area because of the destruction and lack of other powers. Cerea becomes the largest pirate base in the whole ocean. The city is founded on the ruins of a previous fisher village that existed in that place.
The island of Derimir starts to be called Cerea quite quickly.

Period of Lion: First Mentions of Ra
The orginal pirates mostly having died out, Cerea turns more to trade instead of piracy.
Period of moose: The few houses at the crossroads start to be called Vesper, when the Vesper Inn is opened.

Period of Beaver: 11th year, Naye Bay is founded.
Period of Bear: 6th Year, the town of Dyoa is founded in middle of northern wilderness.
Period of Moose: 5th year the Arcane Academy returns to Cerea.
11th year, Bushburrow restablishes links to the rest of the island, having isolated themselves in catalysmic event at end of 4th period.
Period of Wolf: now