Irish-bred, French-raised colt went past his rivals in a blink to take the famous European race at 1 1/2 miles on turf.
Longchamp
A field of 15 goes to the post for one of the world's most famous races on October 1 in France and the favourite is a hometown star.
A field of 20 is entered for one of the world's greatest races with last year's victor Torquator Tasso meeting 3-year-old Luxembourg and mare Alpinista.
The great mare may have to contend with soft turf on Sunday when she tries for another Arc, one year after she was upset on unstable ground.
The Andre Fabre-trained Waldgeist powered past the great racemare Enable in the late stages of Europe's famous Qatar Prix de l'Arc de Triomphe.