Ethereal Blade

The Ethereal Blade is an Item purchasable at the Main Shop, under Weapons.

Ether Blast
Ether Blast converts you and target enemy unit into ethereal form. Ethereal units take 40% extra magic damage and cannot attack or be attacked. Target unit is slowed by 80% for 3 seconds and is dealt 75 + 2x your agility as magical damage (boosted by ethereal form). If you target yourself you won't be slowed nor damaged. Costs 50 mana, has a 30s cooldown and a 800 cast range. Shares cooldown with Ghost Scepter.

Additional Information
Can be disassembled. If you activate Black King Bar and then cast Ether Blast upon yourself you will be both magic immune and immune to regular attacks.