Oblivion:Sigil Stone

thumb|right|A Sigil Stone, still in place in the Sigillum Sanguis Sigil Stones are the powerful artifacts that control Oblivion Gates.  In order to close an Oblivion Gate, you need to find the Sigil Stone in that gate's plane of Oblivion and remove it.  The Sigil Stone is located in the Sigillum Sanguis at the top of the main tower.  Once you pick it up, you will gain one Fame point, the Oblivion Gate will close, and you will automatically be returned to Tamriel in the charred region where the gate was previously located.  You will acquire one Sigil Stone for each Oblivion Gate that you close; there may be up to 60 Gates.

Using Sigil Stones
thumb|right|Sigillum Sanguis after the Sigil Stone has been takenthumb|right|A Sigil Stone
Once taken, each Sigil Stone can be used to enchant one item.  To do this:
# Select the Sigil Stone from your inventory.
# Select any unenchanted, non-quest item in your inventory (weapon, armor, clothing, ring, etc).
# Name the new item.
Once you are done, the Sigil Stone will vanish.  Unlike standard enchanting, this can be done anywhere (an Enchanting Altar is not needed), it does not require a soul gem, and does not cost any gold.  

Each stone has a predetermined strength and two specified effects that are available for enchanting.  One effect for each stone is an offensive effect and will automatically be used if you choose to enchant a weapon.  The second effect is defensive and will automatically be used if you enchant armor, clothing, or other apparel.  These two effects are typically paired; for example, one stone provides either Absorb Fatigue or Fortify Fatigue.

The two effects are randomly determined the moment you see the message "Sigil Stone has been added to your inventory" after activating the Sigil Stone in the Sigillum Sanguis.  The table below provides the list of all possible effects.  If you wish to obtain a specific effect, you should save your game immediately before first picking up the Sigil Stone (it's actually possible to save your game during the delay between activating the Sigil Stone and the stone actually being added to your inventory; after saving, simply check your inventory, reload your save if it's not the one you want, then check it again once it's added).  You can then repeatedly try grabbing the stone; as soon as the relevant message appears on-screen (before being teleported back from Oblivion), you can check your inventory and see which one you have obtained.

The strength of the stone is determined by your level at the moment you pick it up, as listed in the following table.


Effects and Magnitudes

The effect and magnitude of the stone are determined upon receiving it from the tower, as described in the previous section.  This table lists all of the possible Sigil Stones that can be acquired in the game, as taken from the Construction Set.  There are 150 different Sigil Stones in all: 5 magnitudes for each 30 possible pairs of effects.  The list is sorted alphabetically based on the stones' offensive (cast on strike) effects.  The numbers provided under the magnitude for offensive effects are the weapon's charge/cost=uses statistics.  For example, 5250/175=30 means that the weapon will have a total charge of 5250, each strike costs 175, and there are 30 uses before the weapon has to be recharged.


   

  The Demoralize and Turn Undead effect magnitudes are listed in the construction set using points, whereas in-game the magnitudes are based on creature level. Both values are provided in the table, using the conversion from points to level that is described under Magnitude to Level Conversion.

Notes
Some background information on Sigil Stones and the Oblivion Gates they govern can be found within the game by reading Liminal Bridges.
Coming into contact with the Pillar of Flame under the Sigil Stone or jumping over the stone will cause you to lose health very rapidly (specifically, Damage Health 10,000 pts in 3 ft for 5 secs on Target).
The deactivated Daedric Siege Crawler drops a Sigil Stone, which functions the same as a normal one despite being free-rolling.
Although there are only 60 possible gates, it is possible to duplicate Sigil Stones. Because of this, it may be reasonable to wait until Transcendent stones appear, and then begin closing gates to get one of each stone. This way, you can get far more powerful effects than what would be possible otherwise.
Sigil Stones can be moved using Telekinesis. If a Sigil Stone is pressed into the bottom of an NPC and the player pushes it into the air, the NPC will go with it. This can be used to move NPCs that are stuck on objects, or kill them without legal consequences. This is easier with larger creatures such as Daedroths.
One can change the effects of the sigil stone they pick up by saving before they pick up the stone then load that save if the effect is unwanted.

Bugs