The fall of the reptilian empire marks the beginning of the Second Age. A series of natural disasters such as earthquakes marks its end and the beginning of the Third Age, also known as the first Age of Ruin. It is presumably a very long age, where many of the humanoid species found their cultures and establish empires.
Early Second Age
With the available material there seems to be a gap of information about what happens after the fall of the reptilian empire (which we consider the transitional event from the first to second age) to the time the Eastern and Western Dwarves meet (see below). Though given what is known about the later parts of the second age, we can guess that:
- The humanoid species spread over the world. In particular humans.
- The dwarves establish two major cultures, called Eastern and Western Dwarves.
- The elves populate the "big forest" (presumably Wyscan, given its importance today).
Late Second Age
These are notable events taking place in the late Second Age, listed (approximately) chronologically:
- The civilisations of the Eastern and Western Dwarves meet for the first time. They supposedly unite into the greater Dwarven Empire .
- The goblin Sturd betrays the Great Orc (possibly known as Akrübad, mentioned in the poem below). 
- The human empire of Naptesh is founded.
- The human empire of Tsuandan is founded.
- Many elves migrate* out of the "big forest" (presumably Wyscan) to colonise and build cities.
- The elves who migrated sail to Celeda Ablan and colonise it. 
- The elves of Celeda Ablan return to Vetia and tries to rule Wyscan. They give logging rights of the forest to the dwarves. The elves still living in Wyscan fight back against the dwarves, who take this as a breech of agreement, sparking resentment between all three factions. 
- The elves of Celedan Ablan establish colonies in Silexia (could have happened in early Third Age rather than late Second Age). 
Unless otherwise specified, text that green italic in the list above uses the World Hymn poem and tapestry as its source.
The World Hymn
Main article: World Hymn
The World Hymn is a dwarven carving of a poem that details all the nine ages of the world. It was later copied to an Equitan tapestry and supplemented with imagery. A transcript of the poem and the image for the second age are both shown below. 
A time of gold a time of growth
The world was our inheritance
So rich the land so ripe it lay
Our people free, we grew at last
In riches grand and oathbound troth
And long lost kin we were to find
That golden time as West met East
Though trouble brewed and ne’er we saw
That fair-eyed orc that Akrübad
Who soon to come would take and bind
We folk of stone our oaths as firm
And in the Mountains of the Moon
We bound our fates and paid our debts
To kin and kith our honor bound
And wealth to grow to come full term
And all this while the elves did sail
To take the seas and make their seat
On island shore so far from home
Fair Celeda Ablan they wrought
To ply the world on ev’ry gale
And men did then forge crowns and kings
O’er land as far as grass does grow
Yet no good lasts all things take wing
- Jorge Zamoran; An account of the peoples, nations and monsters which inhabit the world: Orcs and Goblins (T9A:FB Rulebook, v1.3.5, p143)
- The World Hymn: the 2nd Age (T9A:FB Rulebook, v1.3.5, p127)
- Informative text about the Infernal Dwarves (The 9th Scroll, issue 7, p38)
- Nazario Calegari (953 A.S.) Circling the Abyss: part VIII - The Way Barred, The Beacon Tower, The Mouths of Hell (T9A: Circling the Abyss, p18)
- Account by Rodomonte (The 9th Scroll, issue 9, p21)
- Informative text about the Dread Elves (The 9th Scroll, issue 6, p26)