Skyrim:Paralysis Rune

Skyrim: Magic: Spells
SR-icon-spell-Paralyze.png Paralysis Rune
Added by Arcane Accessories
School Alteration Difficulty Adept
Type Defensive Casting Fire and Forget
Delivery Target Location Equip Either Hand
Spell ID FExxxD64 Editor ID ccBGSSSE014_RuneParalysisFFLocation
Base Cost 172 Charge Time 0.5
Duration 8 Range 20 feet
Tome ID FExxx818 Tome Value 120
Appears in random loot at level 23+
Purchase from (Alteration lvl 40+)
A Paralysis Rune trap
Cast on a nearby surface, it explodes when enemies are nearby, immobilizing them for 8 seconds.

Paralysis Rune is an adept level Alteration spell that creates a rune which will explode when enemies come near, causing Paralysis for 8 seconds. You can't cast it just anywhere. When you press the cast button, the cross-hair will let you know if you are pointing at a valid surface within range. If it is red, then you can't cast the spell there.