Emperor

"Emperor dragons are danger on a battlefield where many Imperials have fallen. These ghastly behemoths are a mindless monstrosity, fused from the bodies of fallen Imperials with some specimens known to have reached over 100 meters in length. They may possess up to 11 heads - the larger the emperor, the more heads it will possess. Each head is capable of wielding the element of the dragon that spawned it. These monsters destroy without thought and absorb elemental energy from the creatures and landscape surrounding it. Emperors are not to be trifled with. It may take the combined efforts of many clans to bring down an aberration of this magnitude; these dangerous opponents are one of the few creatures that may draw the gods from their shrines and onto a battlefield." - Official Flightrising Description

Emperors are very aggressive, attacking anything that moves without thought.

Emperors utilize both physical and magical attacks.

An Emperor's main line of defense is its sheer size and raw power.

Emperors, being very large, can easily overpower anything smaller than it. The more heads an Emperor has, the more powerful it becomes as the magic it wields will be harder to counter.

Emperors have no outright weaknesses, but their destructive nature makes it really clear where one has been, and thus what areas to avoid.

When killed, the remaining elemental magic within an Emperor's body fizzles out. This trace amount of magic is what keeps an Imperial's body from completely decomposing, so when it finally leaves, the body of the Emperor disintegrates almost immediately.

It is unknown if the ash Emperors leave behind have any value.

Emperors are made when many Imperial dragons die in one place. When left to gather, the stray magic within an Imperial's body draws it towards other sources of stray magic. With time, this causes the Imperials' bodies to fuse, creating an Emperor.

Emperors do not seem to pop up often, as the latest Emperor, Luminax, has been the first Emperor Sornieth has seen in centuries.