public static MaplePacket skillCooldown(int sid, int time) {
        MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();
        mplew.writeShort(SendPacketOpcode.COOLDOWN);
        mplew.writeInt(sid);
        mplew.writeShort(time);
        return mplew.getPacket();
    }