New mod - the Dwemer Defense Drone available on http://skyrim.nexusmods.com/mods/24858 and http://steamcommunity.com/sharedfiles/filedetails/?id=100137603:

Concept by Proteus Draconis over at Skyrim Nexus.

This is an ancient Dwemer artifact that circles you, stunning nearby enemies. After 5 stuns, it will drop to the ground for a few seconds before recharging itself and defending you once again.

Location
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You will find this in the Dwemer Museum in Markarth. Looks around and you will see a new artifact on display. Read the note and do not follow the instructions.

IMPORTANT: This mod is vulnerable to the so-called "Dialogue" bug that affects all Quest mods. That means you must save and load your game at least once after installing this mod before the Drone will appear in the Museum.

Tips
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The Drone is summoned from your Powers list. Using it a second time will deactivate the drone.

Details
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The Drone will stun up to 5 enemies in a row before needing a recharge. After 5 stuns, it will drop to ground (though it will still attempt to follow you) for several seconds, after which it will resume its defense of you.

The Drone will only stun enemies you are in active combat with. Although it makes a faint humming noise, it is considered Silent, so just having it active will not alert NPCs to your presence. Summoning it will, though.

Incompatibility
===============
This mod will have problems with any mod that changes the DweIchorBarrel (00048106) in the MarkarthWizardsQuarters01 cell. If this object is moved or removed, the Drone quest will fail to activate. I am not aware of any existing mods that do this, though, so it shouldn't be a problem.

THIS SPELL IS VERY SCRIPT-INTENSIVE. That means you need a fast CPU (NOT graphics card!) for it to work right. If your computer just barely runs Skyrim as-is, then this mod will probably behave strangely.

Known Issues or Bugs
====================
This mod is vulnerable to the so-called "Dialogue bug" that affects Quests. That means you must save and load your game at least once after installing this mod before the Drone will appear in the Museum.

It is possible for the Drone to get stuck on an obstacle when you move around. If this happens, just use the Dwemer Defense Drone power again to dismiss and re-summon the drone.

The Drone will not follow you between maps. Just re-summon it.

The Drone will have trouble finding a valid target quickly if there are several dead NPCs near you.

Todo
====
Make Drone stay active between maps.

Maybe make the Drone an inventory object that can be charged with Soul Gems.

Possibly add more types of Drones, such as more a aggressive one or one that restores Health.

Technical
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Scripting. Lots of scripting. All the scripts are included in the mod, so if you want to see how it works, just take a look!