Skill description
Send the elements to sap an enemy's defenses and afflict them with Major Breach for 24 seconds, reducing their Spell Resistance by 5280 Also applies Minor Magickasteal to the enemy for 24 seconds, causing you and your allies to restore 300 Magicka every 1 second when damaging them.
New effect
Also applies Minor Magickasteal to the enemy.
Elemental Drain is a skill located in the Destruction Staff (which can be found in the Weapon skill tree). Elemental Drain is a morph of Weakness to Elements.
ESO Skillbook