const countdownEmbed = new MessageEmbed()
    .setDescription('test1')

const countdownEmbed2 = new MessageEmbed()
    .setDescription('test2')
    .setColor('RED')

message.channel.send({ embed: countdownEmbed }).then((msg) => {
    setTimeout(function () {
        msg.edit(countdownEmbed2);
    }, 1000)
})