Ageless

Obtained by killing the dragon summoned when one companion stands on each of the pressure plates and inspecting the Throne in Orzammar.

History
The markings suggest many have held this blade, but their identities are not just obscure, they are forgotten completely, as if by intent. The blade, however, endures, becoming better for each warrior that raised it -- for the time being -- in triumph. Not a benefit willingly given or easily exploitable.

Secret in the Throne Room
The pressure plates in Orzammar Throne Room can only be triggered before the King is chosen. To summon the dragon:


 * 1) Put party on hold ( so they don't follow selected character)
 * 2) Place 1 character on middle of entry hall (the circle in first room) you will hear click
 * 3) Enter the throne room (dead ahead) look to the left wall (Opposite doorway in the right wall) and see two small arrows on the ground, stand one character upon each (it will click for each character)
 * 4) Use last character to click on throne
 * 5) Doors will close, your Party will be back in throne room, Dragon will appear
 * 6) Slay the Dragon and take sword from corpse

note* cannot be done after a king has been chosen for Orzammar

Rune Slots
Ageless is found with no rune slots. There are reports of it "upgrading" itself suddenly to include two rune slots. However, if the sword is sold to Mikhael Dryden then repurchased, it will have two rune slots as any other silverite weapon would.

How to "give" Ageless two rune slots (confirmed in the 1.02a pc version of the game and XBox360):

1. Get Ageless

2. Sell it to a merchant

3. Make a DIFFERENT (it HAS to be different) save file

4. Load the save file and buy back Ageless, now with 2 rune slots (it can take a few reloads)