Canon relevant lore/gameplay question.

[Marisa]

Are the asderal blade, orion sword, and the atlas the same thing, or seperate?

 

[J-M v2.5.5]

As far as I know the "Atlas" is the same as the "Master Sword".

Dreadwind was originally scoped to be the "Endgame" content. In the original design, access to Dreadwind was only given by an Apostle, who would, through a dynamic quest, enlist the help of a group of players to tackle a serious threat arrising on the continent and teleport them. Originally a linear series of 5 maps ending with a climactic battle against Lor Malgoriand himself, the reward for which is a legendary weapon for every character involved, an undroppable/unlootable item, tailored to the character's favorite weapon type. The character deemed most deserving by the group and the Apostle would be given the Atlas (Master sword)

Read more about it here (CTRL+F for "Atlas").

As for the Asderal blade:

Now, as he [Lanethan] had been training with Felewyn, he was adept at manipulating fate. He could look into the sea of knowledge and being that it was, and pick out an individual person or thing, and create new fated things from the old. It was dangerous, but it ultimately gave him the power he required to maintain order. Now, for example, he could fate it to be that he was holding an Asderal blade, a blade forged for the apostles of Order by Felewyn herself, and instantly it would be so.

Read more about it here (scroll all the way down).

I thought they were separate things, but if you read Wuldegren and the Pillars of the Moon, you can find this passage:

She [Felewyn] sent her greatest, Lanethan, to outbalance the forces of Chaos. Lanethan wielded a powerful blade, known then as the Asteral Blade. Its true name was the Atlas, twister of fates, bender of the wierding ways.

So Atlas = Master Sword = an Asderal Blade, by the looks of it.

I have no idea what the Orion Sword is, though.

Oddly enough, there appear to be multiple Asderal Blades (quote from the story Lanethan again):

Only Idemark’s blade, the golden sword fated to exist from the ancient Loreldian city of Asderal, remained intact, though it hummed like a tuning fork from the power radiating off Lor Malgoriand. Lanethan immediately fated himself to have an Asderal blade, and so he held one. He and Idemark slashed madly at the horrible being, but each of their strikes seemed to pass through him as if he weren’t there.

 

[Gurluas]

Actually thats some useful lore for Mss!
Thanks for posting it.