Winged
Version 0.13: This article may not be up to date for the latest stable release of Crawl.
Monsters with the winged flag are flying monsters which fall to the ground when paralysed or petrified. This comes into play most dramatically when they lose flight directly over deep water or lava, killing them instantly. Monsters with the levitate flag are capable of flight without physical effort, and are thus immune to such insta-kills.