halcyon

nouns

a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves
halcyon
is a type of (narrower)
an imaginary being of myth or fable
mythical being

adjectives

idyllically calm and peaceful; suggesting happy tranquillity
"a halcyon atmosphere"
halcyon
is similar to
not disturbed by strife or turmoil or war
"a peaceful nation"; "peaceful times"; "a far from peaceful Christmas"; "peaceful sleep"
peaceable, peaceful
marked by peace and prosperity
"a golden era"; "the halcyon days of the clipper trade"
golden, halcyon, prosperous