The Ritual of Spiritbinding

 Before the incantation begins, you must create a circle inscribed with Auran, Aquan, Ignan, or Terran runes, depending on the type of elemental you intend to bind, and place an inert gearforged body in its center. You must chant an incantation in this language throughout the ritual. At the end of this period, an elemental is summoned into the circle. The caster must make a DC 16 Charisma saving throw to bind the elemental to the construct. If it fails, you take 2d10 psychic damage and 2d10 damage based on the type of elemental (lightning for an air elemental, cold for a water elemental, fire for a fire elemental, or bludgeoning for an earth elemental) from the primal energy radiating from the elemental. The gearforged chassis also fails one death saving throw and is destroyed if it fails three saving throws. If you choose not to maintain the spell or are unable to do so, the elemental is instantly killed, and you drop to 0 hit points and are dying.

If the save succeeds, the elemental is bound to the elemental core and immediately animates the constructed body. The gearforged has its own personality and retains none of the elemental’s memories but might recall fragments as time passes.

If the spellcaster dies during a spiritbinding, the elemental is also destroyed and completely consumes the constructed body.

Up to four other spellcasters of at least 5th level can assist you in the ritual. Each assistant reduces the DC of the Charisma saving throw by 1. If you fail this save, each assistant takes the same damage you do. An assistant who drops out can’t rejoin.