I've actually got two spells to share with you then. Hope you don't mind.
Forked Drain
Calls forth a channeled cone of draining energy on a target enemy unit, hitting up to (VARIABLE) enemy units
draining (VARIABLE) life per second and transferring it to the caster. During the channeling any affected non-hero units will be rooted (entangled). Any over-drained health is (VARIABLE PERCENT) converted
into mana. Forked drain can push the casters mana over its maximum value, dissipating at (VARIABLE) seconds over time.
Earth Tap
GENERIC DESCRIPT: Low cooldown, far ranged, medium radius area effect spell.
The caster taps the earth underneath the target area, damaging any target units by a (VARIABLE) percent of their HP and briefly rooting them. Any damage done is added to the casters mana pool.