found in the sea but used as a greeting

I flutter in silence, yet rule with might, wings painted in crimson sunset, or robes edged in light. In gardens I dance, in courts I preside, a creature, a crown, two worlds I divide.

Amongst the fields of wheat and hay you often see, odds are there's big ol' me! Make sure to keep me under lock and key, otherwise you'll drown in more than just fees!

I am Something that is nothing to what I once was. you may find me in the desert wrapped in tan cloth. I start to roam if you happen to be out at night, yet when the sun rises steady I walk still.

A sunlit stage where sand grains play, The ocean's roar, a song each day. Flip-flops meet, Waves retreat, Where castles rise and kids at bay.