User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/War Against the Saxons/@comment-4135736-20120430082801/@comment-4135736-20120430121029

Thanks for suggesting that about Alvarr and by the way I didn't get time to say my theory of how the war between Camelot and the Saxon's in the Series 4 finale (which would be a two parter) would happen as well as the Dragon battle between Kilgharah and Aithusa, this is how it will happen in my opinion:

Morgana, Mordred and Alvarr have formed an alliance with the Saxon's against Camelot but Morgana (who has now learn't the truth about Merlin) is determined to get rid of Merlin so that their plan will succeed, deciding to expose his secret to Arthur. One day Morgana attacks Arthur when he is on a hunting trip and directly tells Arthur that Merlin is a sorcerer, that he is a Dragonlord and that he knew of her magic all along and later poisoned her. Arthur, in disbelief, accuses Morgana of lying but Merlin says it his true and battles Morgana to protect Arthur, resulting in her fleeing.

Arthur, shocked to see that Merlin is indeed a sorcerer, returns to Camelot and angrilly banishes Merlin from the Kingdom. Merlin then goes to Ealdor and falls into depression to the point that he loses his own conviction to Arthur. Mordred learns of this and informs Morgana who then decides to attack Camelot. Meanwhile, at the same time, Kilgharrah, who has been helping Merlin from time to time with Aithusa, learns that Aithusa saved Morgana's life and they fall out when Kilgharrah vows to kill her if she attacks Camelot.

Morgana, Mordred and Alvarr attack Camelot with the Saxon's at their side and Camelot starts losing, making Arthur tearfully regret his decision to banish Merlin. He, knowing that Merlin went to Ealdor, goes there and Merlin snaps out of his depression, regaining his conviction and embraces Arthur. After apologising to each other, they then go to the Druids and convince them to fight Morgana, Camelot then starts winning with their combined help, forcing Alvarr and Mordred to retreat with some Saxon's.

Morgana, however, stays and has a confrontation with Merlin, they then prepare to fight each other but are interupted by the sudden arrival of Kilgharrah, who wants to kill Morgana, and Aithusa, who wants to stop the war, proving that he is indeed the "light of the sun". Kilgharrah attempts to kill Morgana but Aithusa intervenes and grabs Kilgharrah in an attempt to restrain him, causing Kilgharrah to accidently hit Merlin and Morgana with his tail, knocking them unconscious.

Angered by this, Kilgharrah loses faith in Aithusa, now wanting to kill him, and they engage in a fierce battle until Kilgharrah knocks Aithusa to the ground, almost on Merlin and Morgana, injuring him and breaths fire at him. Morgana, who has recovered, in confliction, conjures a shield spell to deflect Kilgharrah's fire, saving Aithusa, herself and Merlin. Merlin recovers and uses his Dragonlord power to force Kilgharrah and Aithusa to stop fighting and work together again, and they leave.

The Saxon's have all retreated and Morgana leaves in confusion and shock at her actions while Arthur, although shocked at the Dragon battle and Morgana's confliction, decides to return magic to Camelot, much to the relief of Merlin and the Druid's and the episode ends with sorcerers and magical creatures (including Aithusa and Kilgharrah) arriving at Camelot, finally in peace.