Arena of Empires

It started as a tribute to 20 years of Age of Empires 2 last year but since I only finished it recently I'm posting it today at the 20th Anniversary of The Conquerors Expansion.

It's above all a tribute to my first group of online friends, the people from the now extinct "Arena of Empires World", brazilian website and forum about Age of Empires - and later other games - who, in fact, commissioned this piece to begin with. This year marks the 20th anniversary of the website's creation as well. My time at the Arena was a life-changing experience, thanks to Bruno Marconi (MarcMax) for creating such a great place!

There are hidden references to other AoE games and to some things from the Arena. Can you find some?