The Draining Spell

You channel arcane energy into the binding tattoos of masters of each school of magic (to be considered a master, they must be able to cast a spell from that school of at least 7th level) who must remain within 10 ft. of each other throughout the casting time. The energy is emitted from all binding tattoos within the spell’s area, shedding dim light in a 5 ft. radius around each tattoo. Unless a solar eclipse occurs before the spell ends, there are no other effects. However, if an eclipse occurs, the following effects occur.

• All affected creatures must make a Constitution saving throw when the eclipse begins and every minute thereafter to avoid being restrained by the spreading tattoo.
• Affected creatures cannot cast spells.
• All affected creatures lose their lowest level unexpended spell slot at the start of each of their turns, if they do not have any spell slots remaining, they instead take 3d6 necrotic damage.
• The eclipse’s duration is extended to match the spell.
• This spell can no longer be stopped early by any means short of physically ending the eclipse (for example by using the wish spell to move the moon), therefore, it is immune to dispel magic and antimagic field.