Earthgrab

Earth Grab
This Weapon stores the implacable strength of the earth deep within. When this weapon is used, this power occasionally comes to the surface, calling on the earth to erupt from the ground and hold an enemy in place.
 * 4% chance of Earth Grab encasement
 * Reflex save DC of 35 (As of U12 Freedom of Movement no longer prevents Earth Grab)
 * Has a duration of 6 seconds, no recurring saves
 * Deals a small amount of bludgeoning damage every 2 seconds (3 tics total)
 * Target is immobilized, and helpless (monsters take +50% damage from all sources.)

Found on:
 * Epic Ratkiller
 * Green Steel Weapons

Earth Grab Guard
This item stores the implacable strength of the earth deep within. When the wearer is successfully attacked in melee, this power occasionally comes to the surface, calling on the earth to erupt from the ground and hold an enemy in place
 * 4% chance of Earth Grab encasement on getting hit by melee attacks
 * Reflex save DC of 35 (As of U12 Freedom of Movement no longer prevents Earth Grab)
 * Has a duration of 6 seconds, no recurring saves
 * Deals a small amount of bludgeoning damage every 2 seconds (3 tics total)
 * Target is immobilized, and helpless (monsters take +50% damage from all sources.)

Found on:
 * Green Steel Accessory
 * Dragontouched Armor with Sovereign Rune
 * Rock Boots from Cannith Challenges