Nystul's Grue Conjuration

This spell, which is actually a group of four risky spells, will summon one grue-harginn, ildriss, chaggrin, or varrdig-from one of the four Elemental Planes. The type of grue to be summoned must be decided before the caster memorizes the spell.

Grue are notoriously untrustworthy and difficult to control, so the caster must rely on more than just concentration to keep the grue under his command. As soon as the grue is summoned, it will demand a payment from the caster for its service. The payment offered must be at least 500 gp worth of goods of interest to the grue, or the grue will be angered and immediately attack the caster. If the grue is satisfied with the offer, it will grudgingly perform one service for the caster for the duration of the spell. The grue will try to subvert or openly disobey the caster's orders if it finds them unpleasant.

Special material components are used to summon the grue desired. These include incense (air grue), soft clay (earth grue), sulphur (fire grue), sea water (water grue).