hiya mate
-imperial: has the same power whith the normall units but to buy imperial units you spent some saphires and some recourse
to buy a normall units you spent ONLY recources but no saphires,you just have to spent more recources than the imperials but the reason you spent less recources to buy an imperial is cause you spent and some saphires at the same time
-eldrich:is a category of units you win,you CAN NOT make ,buy or build you just win them from the tournament and battleground quest anyway you can just win them.this units is
- stronger than than normall units
- consume less food than normall units
- move faster than the normall units
so eldrich dragon is better than normall dragons
eldrich knight is better than normall knight etc
-dark units:dark units again is better than normall units they eat less food and they are stronger than the normall units BUT their speed is the same whith the normall units so eldrich units instead of stronger is faster than the normall units somethink dark units dont have.
so the conclusion:
- imperial is same whith normall units about the abilities just diferrent way to buy them,
- dark units is stronger than normall units eat less but dont move faster something eldrich can do so eldrich is the faster units
between eldrich and dark units you probably ask who is stronger,eldrich is faster than dark units their power is almost equal ussualy eldrich have better balance but keep this the dark dragon is better than eldrich dragon all other kind of dark and eldrich units is almost same if you check their statistics.
how you can find dark units you probably ask
dark units can make only leagues whith beacons,thats the role of beacons to make dark units.
Beacons is some buildings that capture leagues and they need protect them once there is a war whith beacons,let me tell you that it is a silly war once many leagues sometimes lose more than take on the try to capture beacons only coiner leagues dominate :p forget it all this is another story if you need somethink else to explain or dont understand let me know