This Spell will be treated slightly differently in my Dark World Setting, the actual Planar Summons Spell is not one spell, but a grounding in the basics of Summoning planar creatures and includes learning to summon Watcher Spirits. To actually summon the various creatures takes seperate formula for each and each version has its own special requirements.
All summoning spells require material components, and a Protective Circle, Pentagram, Medicine Lodge, Hougan, etc. The material costs and needs vary with each type of creature, please consult the individual descriptions.
Air Elemental: Magery 1, and either 8 Air Spells or 4 Air Spells and Summon Fire Elemental or Summon Water Elemental
Earth Elemental: Magery 1, and either 8 Earth Spells or 4 Earth Spells and Summon Fire Elemental Summon Water Elemental
Fire Elemental: Magery 1, and either 8 Fire Spells or 4 Fire Spells and Summon Air Elemental or Summon Earth Elemental
Water Elementals: Magery 1, and either 8 Water Spells or 4 Water Spells and Summon Air Elemental or Summon Earth Elemental