Brace yourself to realise that this puzzle is even cleverer than you first think... This is a special one...
The seven-letter answer is:
To replace the underscores with a seven-letter word, note that:
For this reason, I believe the final sentence the OP is looking for is:
HOWEVER - HOLD THE PHONE... So far this is little ...
The flags here are
Also, in each circular round of flags, there is
Decoding (two stages)
In each case, I'm
Starting from the innermost ring:
The only one of these which makes sense right away is
Now we have enough words to
So the 12-letter word is
That was fun! Each step through the ...
As tradition requires, here's the finished product first. Progress pictures at the end of the answer.
Then, we remove the words from the grid, tighten everything up, and repeat for
Lather, rinse, repeat. Theme 3:
And finally, Theme 4:
Everything below this point is only preserved to show solution progress.
Well. This seems a bit ...
Final answer: The secret to 'A Radiance Enduring' is:
TL;DR - There are several steps to solving this cipher:
Now for the full explanation, reflecting my solving process... (Including an account of the various errors of judgement I made, and how I repeatedly made this whole thing unnecessarily hard for myself!)
The first thing to note upon considering ...
However, we can do the following:
Large grid with instructions
I found only one way of doing this (but this was before the top row was added):
Stars, 4's and 2's
The best fit I found was:
If we however proceed to
Some final notes
Following up on @sarsaparilla's answer:
Reverse engineering it back to the original form (and not worrying about exact colors and fonts, I get:
Like @sarsaparilla, I don't know what to make of the colors.
Edit: Per request, the "solved" grid:
Edit: an observation about the bottom colors and the rows.
perhaps the bottom ...
Very partial answer, but hopefully a first step in solving this puzzle.
Seeing the properties of the drawn grid, my first hunch is that we might be looking at a
This is excluding the line of 9 colored boxes at the bottom,
Furthermore, I noticed that
This is what I have so far. What I haven't figured out yet is ...
The final answer is:
To solve this, first consider the two poems. These provide some clues as to what is expected of us. Most notably:
Turning to the top half of the diagram:
Now for the bottom half of the diagram:
We now have two strings of letters - what do we do with them?
Using the anagram tag means these will rearrange to:
@Glorfindel found the first and last letters of the Product Code™, but sadly he did not notice that
In the case of broccoli,
Therefore, we shall mark the broccoli with the Product Code™
However, don't forget to upvote @Glorfindel's answer as well, for he solved two thirds of the Product Code™ (with help from @El-Guest) :)
NB I had originally just deduced the final 2 missing letters and the passcode, but since this answer was awarded the green checkmark by the OP for completing the puzzle I am editing in sufficient detail to make this a complete answer. Please note that @Reinier did most of the heavy lifting (5 letters) and @Deusovi contributed significantly too (1 letter and ...