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Regarding how the question could be improved - here's what a complete, minimal code sample would look like in a question such as this one:

$ cat tst.awk
$2 == "FAML" { display = 1 }
$2 == "END" { display = 0 ; next }
display { print }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i <= nlines; i++) {
        print "Luci:", astr[i]
    }
}

Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some other information.
Luci: ##  Even more text.

$ cat tst.awk
$2 == "FAML" { display = 1 }
$2 == "END" { luciferin(rec); rec = ""; display = 0 ; next }
display { rec = rec $0 ORS }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i < nlines; i++) {
        print "Luci:", astr[i]
    }
}

$ awk -f tst.awk input
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some other information.
Luci: ##  Even more text.

which you can then take away apply the concepts from it to your real code.

Regarding how the question and the OPs questions in general could be improved - here's what a complete, minimal code sample would look like in a question such as this one:

$ cat tst.awk
$2 == "FAML" { display = 1 ; next }
$2 == "END" { display = 0 ; next }
display { print }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i <= nlines; i++) {
        print "Luci:", astr[i]
    }
}

Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ##  Some other information.
Luci: ##  Even more text.

$ cat tst.awk
$2 == "FAML" { display = 1 ; next }
$2 == "END" { luciferin(rec); rec = ""; display = 0 ; next }
display { rec = rec $0 ORS }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i < nlines; i++) {
        print "Luci:", astr[i]
    }
}

$ awk -f tst.awk input
Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ##  Some other information.
Luci: ##  Even more text.

which you can then take away and apply the concepts from it to your real code.

The fact that your real code does coloring or whatever else is utterly irrelevant to the problem you want help with which is simply how to store a blcok of text and call luciferin() to print it modified in some way.

The fact that your real code does coloring or whatever else is utterly irrelevant to the problem you want help with which is simply how to store a block of text and call luciferin() to print it modified in some way.

Given a clear, simple example like that we can very quickly show you a solution, e.g.:

$ cat tst.awk
$2 == "FAML" { display = 1 }
$2 == "END" { luciferin(rec); rec = ""; display = 0 ; next }
display { rec = rec $0 ORS }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i < nlines; i++) {
        print "Luci:", astr[i]
    }
}

$ awk -f tst.awk input
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some other information.
Luci: ##  Even more text.

which you can then take away apply the concepts from it to your real code.

Since there's neither a minimal complete example of code, nor adequate sample input/output to test with, this is obviously just an untested guess but it looks like you should change:

display { print }

to

display { rec = rec $0 ORS }

and

$0 ~ end_ere { display = 0 ; next }

to

$0 ~ end_ere { luciferin(rec); rec = ""; display = 0 ; next }

or similar and tweak luciferin to remove the additional trailing newline from it's arg before printing.

Since there's neither a minimal complete example of code, nor adequate sample input/output to test with, this is obviously just an untested guess but it looks like you should change:

display { print }

to

display { rec = rec $0 ORS }

and

$0 ~ end_ere { display = 0 ; next }

to

$0 ~ end_ere { luciferin(rec); rec = ""; display = 0 ; next }

or similar and tweak luciferin to remove the additional trailing newline from it's arg before printing.

Regarding how the question could be improved - here's what a complete, minimal code sample would look like in a question such as this one:

$ cat tst.awk
$2 == "FAML" { display = 1 }
$2 == "END" { display = 0 ; next }
display { print }

function luciferin(mstr) {
    nlines = split(mstr, astr, "\n")
    for (i = 1; i <= nlines; i++) {
        print "Luci:", astr[i]
    }
}

and some sample input to demonstrate your needs and test with:

$ cat input
## Beginning of file

Some text and code

## FAML [ASMB] KEYWORD
##  Some information.
##  Some other text.
## END OF FAML [ASMB]

## Other text

## FAML [ASMB] KEYWORD
##  Some other information.
##  Even more text.
## END OF FAML [ASMB]

More text and code

and the expected output given that input:

Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some information.
Luci: ##  Some other text.
Luci: ## FAML [ASMB] KEYWORD
Luci: ##  Some other information.
Luci: ##  Even more text.

The fact that your real code does coloring or whatever else is utterly irrelevant to the problem you want help with which is simply how to store a blcok of text and call luciferin() to print it modified in some way.