It is improper, however customary, to refer to the denizens of the dimension of Oblivion as "demons." This practice probably dates to the Alessian Doctrines of the First Era prophet Marukh -- which, rather amusingly, forbade "trafficke with daimons" and then neglected to explain what daimons were.
It is most probable that "daimon" is a misspelling or etymological rendition of "Daedra," the old Elven word for those strange, powerful creatures of uncertain motivation who hail from the dimension of Oblivion. ("Daedra" is actually the plural form; the singular is "Daedroth.") In a later tract by King Hale the Pious of Skyrim, almost a thousand years after the publication of the original Doctrines, the evil machinations of his political enemies are compared to "the wickedness of the demons of Oblivion... their depravity equals that of Sanguine itself, they are cruel as Boethiah, calculating as Molag Bal, and mad as Sheogorath." Hale the Pious thus long-windedly introduced four of the Daedra lords to written record.
But the written record is not, after all, the best way to research Oblivion and the Daedra who inhabit it. Those who "trafficke with daimons" seldom wish it to be a matter of public account. Nevertheless, scattered throughout the literature of the First Era are diaries, journals, notices for witch burnings, and guides for Daedra-slayers. These I have used as my primary source material. They are at least as trustworthy as the Daedra lords I have actually summoned and spoken with at length.
Apparently, Oblivion is a place composed of many lands -- thus the many names for which Oblivion is synonymous: Coldharbour, Quagmire, Moonshadow, etc. It may be correctly supposed that each land of Oblivion is ruled over by one prince. The Daedra princes whose names appear over and over in ancient records (though this is not an infallible test of their authenticity or explicit existence, to be sure) are the afore-mentioned Sanguine, Boethiah, Molag Bal, and Sheogorath, and in addition, Azura, Mephala, Clavicus Vile, Vaernima, Malacath, Hoermius (or Hermaeus or Hormaius or Herma -- there seems to be no one accepted spelling) Mora, Namira, Jyggalag, Nocturnal, Mehrunes Dagon, and Peryite.
From my experience, Daedra are a very mixed lot. It is almost impossible to categorize them as a whole except for their immense power and penchant for extremism. Be that as it may, I have here attempted to do so in a few cases, purely for the sake of scholastic expediency.
Mehrunes Dagon, Molag Bal, Peryite, Boethiah, and Vaernima are among the most consistently "demonic" of the Daedra, in the sense that their spheres seem to be destructive in nature. The other Daedra can, of course, be equally dangerous, but seldom purely for the sake of destruction as these five can. Nor are these previous five identical in their destructiveness. Mehrunes Dagon seems to prefer natural disasters -- earthquakes and volcanoes -- for venting his anger. Molag Bal elects the employment of other daedra, and Boethiah inspires the arms of mortal warriors. Peryite's sphere seems to be pestilence, and Vaernima's torture.
In preparation for the next instalment [sic] in this series, I will be investigating two matters that have intrigued me since I began my career as a Daedra researcher. The first is on one particular Daedroth, perhaps yet another Daedra prince, referred to in multiple articles of incunabula as Hircine. Hircine has been called "the Huntsman of the Princes" and "the Father of Man-beasts," but I have yet to find anyone who can summon him. The other, and perhaps more doubtful, goal I have is to find a practical means for mortal men to pass through to Oblivion. It has always been my philosophy that we need only fear that which we do not understand -- and with that thought in mind, I ever pursue my objective.
A hundred and twenty numbered ages in the void that fated folk had grown deep-schooled in evil. Then the Bright Gods resolved to punish those faithless spirits, and shatter the unruly caitiffs, those huge, unholy scathers, loathsome to the Light. They repented exceedingly that they had gazed upon Oblivion, and seen there the first of dark kin, and welcomed them as brothers and sisters.
The Principalities of Victory beheld how great was the wickedness of the wayward spirits, and saw that they were bold in sin and full of wiles. They resolved then to chasten the tribes of daedra, and smite darkkind with hammer and hand.
But ever shall Darkness contest the Light, and great were the Powers that breathed the void and laid waste upon one another, and no oath might bind them, so deep were they in envy and perfidy. For once the portals are opened, who shall shut them upon the rising tide?
Hear me, children. Once I was a lowly man such as yourselves. By my will I entered the ranks of the gods. By your unquestioning devotion, you can share my glory.
Most Necromancers are fools and weaklings. Fodder for the witchhunters. But you, my servants, you are among the chosen. In the days to come, few will dare to stand against your might. But one obstacle remains. His name is Arkay.
He was also a man who entered the ranks of the gods. The similarities between his mortal life and my own astonish even me. It is only proper that we should be enemies.
Arkay's Blessing prevents the souls of men, beastmen, and elves from being used without consent. Arkay's Law prevents those buried with the proper rituals from being raised to serve my children's will. As you know, my children, Arkay's Blessing is flexible to those with daring, but Arkay's Law is unwavering.
To the Scholars: Humiliate the priests of Arkay. Reveal the primitive burial customs to be mere superstition. Befriend kings with honeyed words and bind them to your will. Look to my children in Cyrodiil for guidance.
To the Priests: Use your servants sparingly, let none be seen by the living. Let the memories of the undead waste away from the people. Send missionaries to the unbound dead, to the Vampires and the Liches. Let all the nations of dead carry my banner and my banner alone.
To the Hidden: Wait, as always, in the darkness.
For soon we shall strike. The Temples of Arkay will be torn stone from stone. The blood of his priests will sate our thirst; their bones will rise as our servants. The name Arkay will be stuck [sic] from the records. Only I shall hold sway over life and death. Only one name shall be whispered in fear. The name of your lord and master.
Master Arctus said:
The moment to prepare your offense is the moment the enemy becomes vulnerable to attack.
Leros Chael: Knowledge of the enemy mage's mind is of the foremost importance. Once you know his mind, you will know his weaknesses.
Sedd Mar: Master Arctus advised Tiber Septim before the battle of Five Bridges not to commit his reserves until the enemy was victorious. Tiber Septim said, "If the enemy is already victorious, what use committing the reserve?" To which Master Arctus replied, "Only in victory will the enemy be vulnerable to defeat." Tiber Septim went on to rout an enemy army twice the size of his.
The enemy's vulnerability may be his strongest point; your weakness may enable you to strike the decisive blow.
Marandro Ur: In the wars between the Nords and the Chimer, the Nord shamans invariably used their mastery of the winds to call down storms before battle to confuse and dismay the Chimer warriors. One day, a clever Chimer sorcerer conjured up an ice demon and commanded him to hide in the rocks near the rear of the Chimer army. When the Nords called down the storms as usual, the Chimer warriors began to waver. But the ice demon rose up as the storm struck, and the Chimer turned in fear from what they believed was a Nord demon and charged into the enemy line, less afraid of the storm than of the demon. The Nords, expecting the Chimer to flee as usual, were caught off guard when the Chimer attacked out of the midst of the storm. The Chimer were victorious that day.
When planning a campaign, take account of both the arcane and the mundane. The skillful battlemage ensures that they are in balance; a weight lifted by one hand is heavier than two weights lifted by both hands.
When the arcane and mundane are in balance, the army will move effortlessly, like a swinging door on well-oiled hinges. When they are out of balance, the army will be like a three-legged dog, with one leg always dragging in the dust.
Thus when the army strikes a blow, it will be like a thunderclap out of a cloudless sky. The best victories are those unforeseen by the enemy, but obvious to everyone afterwards.
The skillful battlemage ensures that the enemy is already defeated before the battle begins. A close-fought battle is to be avoided; the fortunes of war may turn aside the most powerful sorcery, and courage may undo the best-laid plans. Instead, win your victory ahead of time. When the enemy knows he is defeated before the battle begins, you may not need to fight.
Victory in battle is only the least kind of victory. Victory without battle is the acme of skill.
Conserving your power is another key to victory. Putting forth your strength to win a battle is no demonstration of skill. This is what we call tactics, the least form of the art of war magic.
Thulidden dir'Tharkun: By 'tactics', Master Arctus includes all the common battle magics. These are only the first steps in an understanding of war magic. Any hedge mage can burn up his enemies with fire. Destroying the enemy is the last resort of the skillful battlemage.
The battle is only a leaf on the tree; if a leaf falls, does the tree die? But when a branch is lopped off, the tree is weakened; when the trunk is girdled, the tree is doomed.
If you plan your dispositions well, your victories will seem easy and you will win no acclaim. If you plan your dispositions poorly, your victories will seem difficult, and your fame will be widespread.
Marandro Sul: Those commonly believed to be the greatest practitioners of war magic