Did you mean halcyon?
halcyon
noun
°In classical legends, a bird said to nest on the sea, thereby calming the waters.
°a kingfisher.
adjective
°Pertaining to the halcyon or kingfisher.
°Calm, undisturbed, peaceful, serene.
synonyms: at peace, blissful, calm, peaceful more» , prelapsarian, relaxed, serene