Here is a grid-deduction puzzle, whose mechanics I have seen under several names such as 'Castle Wall', which is the one I'll use here.
The goal of Castle Wall is to draw a loop enclosing all the numbers in the grid, such that the number represents how many cells it can 'see' orthogonally, including itself. Below is an example puzzle and its solution to clarify how this works.
Below, is your actual challenge. The answer is a four letter word which is quite thematic with the entire solving process of this puzzle.
PSA to anyone who has already made progress, row 3 column 2 has been edited to clear up an ambiguity. Sorry for the error!
FINAL PSA: Row 3 column 2 has been edited yet again... Yours truly was a bit of a doofus, and cleared up the ambiguity in the wrong way! It's definitely correct, now! Super super sorry for this silly mistake.
PSA again?!? Sorry folks, another edit (I know, how careless can I be?) thankfully, this edit doesn't affect anything you've done so far. A red symbol has been changed in row 2 column 2.