Arcanaeum

Spell Siphon

3-level Necromancy

This devious spell envelopes the casters hand in a hungry red aura that devours nearby magical energy.   On the turn it is cast and each turn after for the duration, as part of the spell, the user may make a melee spell attack, dealing 1d6 manaburn to a target. A targets Mana is reduced by the amount dealt by the Siphon. If the target is out of Mana, or never had any, the target takes manaburn to their health pool instead.   In addition, when the spell successfully deals damage to a creatures Mana, half the amount of manaburn dealt is returned to the caster as usable Mana. No Mana is retrieved in this way if the target has no Mana or is out of Mana.
At higher levels: The caster may choose to empower the spell further by spending additional Mana. For each additional point of Mana spent after three, the caster adds an additional d6 of manaburn.