You summon to an unoccupied space within 90 feet of you that you can see a spectator.  The spectator is friendly towards you and your companions, unless attacked by one of you.  The spectator should be tasked with protecting a location or item and it will do so for 101 years.  The spectator acts on its own initiative.  For as long as you maintain concentration you can command the creature as a bonus action.  Once concentration is broken, the creature still exists and as a bonus action you can try to 'suggest' a course of action to the creature, but it is not guaranteed to follow it. (DM will roll a d100 and if the die roll is less than the number of years the spectator has existed on this plane, then it may interpret it's directive broadly, otherwise it will follow exactly.) 

This spell consumes all material components.  Creature cannot be dismissed by ending the spell, it remains until sent to another plane using magic, or is killed.  If the creature is not killed it will remain and guard the location or item of the summoner's choosing for up to 101 years.  The longer it has been since the spectator has been summoned, the more likely it is for the madness that is their type to affect them. 

If this spell is cast at level 7 or higher, then a Gaust is summoned instead of a Spectator.

Note: You must have all material components, and they are consumed in casting this spell.  An arcane focus or component pouch does not allow you to bypass these material components.