@Archimonde You and Daffa of course.
I can control him myself though, it depends on your opinion.
And yeah,thats great!
@Mythic
Here.
That is a concept of him in temple of aienshi , yet broken at some parts due to long pass of time.
The concept shows the ability of the great one to disguise himself as any living or dead, and fool others at the right side (which he is holding a symbol , that is his wand appearing to show as a symbol. The great one used it to corrupt people or unleash chaos). The left side shows his true self (yet still not his "Real" appearance which as he shows himself as a demon to the mortal world) , The lower of the left side describes that the real "form" of The Great One is unknown and the upper shows that he might disguise himself as one, but inside only lies evil and chaos (described in his eye glowing with red at the left side).
Notes about Nightmare:
Note1: Nightmare is kinda corrupted and demonic due to The Great One's powers.
Note2: Nightmare uses pure energy powered by the shard as he depends on the great one.
Note3: Nightmare can breath Energy (white) fire and fire Energy (white) bolts (well actually fireballs but with energy instead of fire).
Note4: Nightmare will try to attack with his hands and feet , also head if reachable on close range just like any other dragon.
Note5: Nightmare sometimes will just fly away and attack from air then return to ground after some time.
Note6: If the great one is defeated and banished from the world before nightmare's death (if that happens) , Nightmare turns into normal form and flies away to his lair.
Note7: Nightmare is immune to disabling effects due to his huge size (Not fully though, his leg can be freezed for example but he smashes the ice after few seconds, Not full body can be frozen though).
Note8: Nightmare is immune to burning being a fire dragon. He can be frozen at minor parts (hands , legs. Does not include head)
Note9: Nightmare shouts at sometimes (usually when taking off), create a huge wind with his wings pushing units away.
I guess thats all...