I think you are a
My prefix should come before an action
For without, it is likely to fail
My infix is part of a path
On which you may ride or sail
My suffix is an interconnection
That links many a node
I keep to the humble path
That my master has bestowed
I want to say
Two words are homophones
One that is paid
but cannot be bought
The other is stated
but cannot be undone
I know this goes in a strange direction at the end. For the last clue... either I figured out the trick part of the puzzle, or it's just plain wrong, and I'm honestly not sure which. The one before it came from the meta-knowledge that ...
You know what - you really are a:
My first brings in the light from the stars
The other is preferred before the time of cars
Before you even knew
I am born within you
I seek to unease but leave without a scar
I guess the "you" in the riddle must be
You fill all earths emptiness
The higher I go, you get less
If you go away nobody will stay
The jellyfish might still play.
Oh I, representative of all being
Oh I, just you I will keep needing
Oh you, not visible but irreplaceable
Oh you, so essential but untraceable
The answer could be:
My infix spells an alphabet,
And can put things to action
My prefix means to criticise,
And undo or inaction
My postfix is a sound
And to a plant, it is bound
As a verb I am found
I place you back on the ground
I think you are a
My prefix can fool you
Even though it’s not a pro
My infix is a pipe
Through which fluids flow
My postfix: a conjunction
But more of a disjunction
I have no intersection
I am musical in function
I wonder if you might be a:
My name is akin to my size
Each can be complex or concise
I remain within gaze
In front of your face
Observable under the right eyes
In multiple forms I exist
In strenuous times I assist
With so much potential
I am quintessential
Attempt to unveil me, I insist!
Update - Thanks to @hagfy, the pattern has emereged.
The final message is:
Which fits the story quite nicely.
The message can be extracted from the cipher poem as below:
Regarding a couple of the hints:
Guess based on the latest hint:
Don't worry, I won't let you overflow.
Is anyone operating on you? I won't let you overflow by that.
Do you want to link yourself? I won't let you overflow by that.
Is there an expression of the unspecified? I won't let you overflow by that.
Is someone really crossing the line? I won't let you overflow by ...
The nonsense characters are
(Note: I didn't look at AHKieran's answer.)
The connection to Halloween or hiking isn't obvious to me, though.
MOehm points out in comments that
Maybe the answer is just