You chant the words "Rel Xen Um".  Your appearance begins to wither as you take an ethereal form.  

For the next hour, as long as you maintain concentration, all attacks you make gain the mana leech ability.

When mana leech is applied, all of the creatures damaging spells will be reduced by 1d4

When cast at a 2nd level or higher you gain advantage on your concentration checks and add 1d4 per level