BRAD SAID: "If you control all 4 the elemental shards you can cast the spell of mastery and win"
I have here this video where Brad says that. It is in fact a very cool concept but I am not sure if it is still implemented.
The reason why I love that is that it implies that there are only 4 elemental shards: one of each kind, that they are therefore extremely rare and they are crucial strategic points. In a place where city spamming is so common that cities become a micromanagement nightmare and a boring thing to see, anything unusual and special is a plus!
Also that concept would add some spice to multplayer by forcing players to explore the map and find them (if more than 4 shards are needed in the actual system, just make 4 hypershards or call them whatever). That would give an incentive to build boats, which at the moment are a cool concept but not very useful since the while map can be explored by walking (unless the AI learns how to use boats that won't change). Of course teleport will also spoil this concept of the game, (making shards too easy to reach, making boats useless, destroying the epic sense of the game by compressing the map, etc...) That's another reason to make teleport spells and gates optional.
Regarding the 4 shards (or "hypershards"), I would also make sure that they would be forced to appear far from each other. We don't want that quest to spoil the game by becoming too easy for a specific player.