An Expansion available to all factions once an empire reaches Era IV. The Throne can only be built once in the world, meaning that once it is built by one empire it cannot be built by any other empire, and cannot be rebuilt by anyone if the city it was built in is razed. If the Throne is completed by another empire before you, you will be refunded the strategic resources spent to build it and given an amount of Dust based on how far construction had progressed.
Completing the Throne of Emperors also completes the Legendary Deed "Elder of Auriga".
If you play with Endless Legend Community Patch then Throne of Emperors reduce Influence cost of Empire Plan by 30% instead of diplomatic cost, as at the latter game stage was often either useless or even counter productive for players pursuing the Diplomatic Victory.
In this lofty building the greatest lords, merchants, and ambassadors meet to discuss the gravest matters. There are many chairs, but only one throne - and all Aurigans bow when you sit upon it.
It is highly recommended that the Cultists or any faction seeking to achieve a Diplomatic Victory build the Throne of Emperors.