Erol's Floating Nest

This spell creates a perfectly shaped bird nest, 5 feet in diameter, that floats 5 feet above the ground in an unoccupied space of your choice that you can see within range. The nest remains for as long as the caster keeps his concentration. The nest can hold up to 300 pounds. If more weight is placed on it, the spell ends, and everything in the nest falls to the ground. The nest will follow a target of your choice and you can change the target at will. while the target are within 10 feet, the nest is immobile. If the target is more than 15 feet away from it, the nest float forwards it so that it remains within 15 feet of the target. the nest can move across uneven terrain, up or down stairs, slopes and the like, but it can’t cross an elevation change of 10 feet or more. For example, the nest can’t move across a 10-foot-deep pit, nor could it leave such a pit if it was created at the bottom.
If the caster moves more than 100 feet from the nest (typically because of you leaving the nest), the spell ends.