Agile Flier. Opportunity attacks against the screaming devilkin have disadvantage while it is flying.

Ceaseless Screaming. Any creature other than a screaming devilkin that starts its turn within 30 feet of one or more screaming devilkins and can hear it must make a DC 10 Wisdom saving throw. On a failure the creature is incapacitated until the start of its next turn. On a success, the creature suffers no effect.

Stunted Legs. The screaming devilkin has disadvantage on attack rolls and all attack rolls made against it gain advantage while the devilkin isn't flying.