With future perfect (F2) you jump to a point in the future, turn round and say some action is finished then. Actually a complicated thing and cumbersome and in most cases you can express the same idea much simpler without using F2. This tense existed in Latin and it was imitated by writers.
In current English usage, muse can refer in general to a person who inspires an artist, writer, or musician.
creator - a person who grows or makes or invents things. individual, mortal, person, somebody, someone, soul - a human being; there was too much for one person to do. architect, designer - someone who creates plans to be used in making something (such as buildings)