The Olympics
It is of course based on the Greek Olympiad. Today the symbol of the Olympics is a flag with five circles resembling five continents. To port it to Erebus and not to lose the original theme I thought maybe to change the meaning of the circles to the five rases of Erebus: Human, Elf, Dwarf, Orc, Gnome[I see Luchiurship as gnome but if I there is another rase I have forgot give me a hint, no not the vampires

, maybe Dragons? ] Its purpose is to spread the idea of peaceful competition between nations and rases. I think it would perfectly fit to the Emperian theme. When I designed it it thought as the Lugus gift to the world.
It is a NATIONAL WONDER witch will give the ability to build it to other civilisations without the required tech.
Effects:
- it destroys the Olympics upon build if there are any in the world
- gives the ability to build it to other civilisations[this way you can either chose to invest your production on something beneficial that can be taken from you the next turn{hurried by an engineer}, it should be expensive but not too much so normally you will get the chance to be happy about it but not for long]
Additional effects:
- +1

in your empire
- +1

in the city that has it
-
no one can start a war with you [my first idea but it would be game breaking on smaller maps I think]
- diplo bonus while you have the wonder with everyone
- +4

for the city
- +1

in each of your cities on the continent
- +50%

yield for the city
-

for the city [all the tourists

]
-
it is destroyed when you start a war!
Comment: It gets more powerful later when you have the trade civics and buildings but the initial bonuses are also good, especially for culture wars since you can move it [after someone builds it].
Requirements:
- you can't be in a war with anyone to build it
- tech: I was thinking when I designed it that Honour would be perfect for it but now when it creates a religion it may be to much, so I propose some additional technology that would require theatre [it is a dead end tech anyway] and honour -> Sports [gives access to 'The Olympics', can build 'Gimnasium': +1

, +% chance to win a competition when taking part in the olimpics{the bigger the empire the bigger chance you will get a champion

}]
Extra:
Just imagine how many events can be created just for this single building!
Some examples:
1. A chance every turn that one civ will have a 'victory' in one competition that will make the ppl of that civ happy for a short time. The civ will get 5 to 10 turns +1

in their empire. The chance that the host empire will win will be slightly bigger.
This can only happen to civ that can take part in the olimpicks, that means if they are not in a war[for any reason]
2. A diplo bonus, positive or negative for competing civilisations. Some civ can be sour losers
3. 'Magical stimulant scandal!' - a diplo modifier for all participants towards cheating civilisations, bigger chance for evil civils, another event would be a decision if you want to cheat

[will upper the chance of the #3 event but also upper the chance to get a win]
4. Boycott your rivals games - remember Moscow?
...and so on
We could have a special screen with competition lists, the history of a competition [witch civilisation won witch], etc.