However, with that aside, the fact that forbidden dark magic was mentioned, can be dispelled through holy methods, yet the thing that dissipated the void is called "positive energy", it really begs the question of whether it is holy manipulation or actually void nullification.
This isn't really a question, considering Dagruel is a Demon Lord and doesn't have Holy Magic, positive energy is just the existence's energy.
You claim that Velda's God Key lacks laws. However, where is the evidence or proof that explicitly states it lacks laws?
If we have the proof needed to make this inference, we do not need a direct statement.
Velda created several laws governing existence, so how can it be said that his existence lacked such laws?
Veldanava didn't just create a few laws, the laws he created govern all existence. Everything that exists stems from these eight attributes and certain fusions of these attributes, the True Dragons known as the source of the World are embodiments of parts of these attributes, even the True Dragon Veldanava.
Velda had the ability to establish and control these laws, it implies that his power and existence were inherently tied to them
Contrary to what you says, in fiction God is generally depicted as independent of his creations.
@Ultima_Reality states that he can be generous in this regard (thought Veldanava might qualify for BDE Type 1 because it preceded the attributes of space and time).
So I'm not seeing the concept of space in literal the same abstractions we are referring to.
Subspace is stated to be a space-time void, supported by the statement that it cannot be traveled with standard spatial abilities and is completely free from the constraints of time. Therefore, it is quite obvious that there was no concept of space in the beginning, but the concept of space existed together with the Great Spirit of Space. There is many proofs, such as that the World Laws that channel the space attribute include spatial abilities, so this is not even an discussion.
Is Hell filled with Magicules, or is the Hell Void itself made up of Magicules? These two cases would be different. Can you elaborate?
Hell is defined as both "bottomless darkness" and "forbidden void/emptness". It is also stated that Hell is full of magicules, and these magicules create demons (embody of darkness attributes), the same dark attributes that manipulates the void of hell. I don't think Hell is made up of magicules, but it can be said to be made up of the darkness attributes, and magicules can both create and manipulate this darkness attribute.
I mean an original creation that Velda brought into existence—something that didn’t exist before his intervention.
As I said at the beginning, we don't know this yet, but we do know that Veldanava gave up his omnipotent form and incorporated himself into creation with the True Dragon form (consist of fundamental information), and used the Great Spirit of Light to create the seven Seraphim in True Dragon form. So there is no contradiction for it to be this way, but there is no statement to support the other arguments.
Could you share the specific scan regarding the Void of the Beginning? So far, I’ve only seen scans related to Subspace, and I might have missed it.
The non-existence of the Great Spirits that constitute all aspects of reality in the beginning, and the fact that the Subspace, which is the space between the Worlds, is void, proves that creation was built on void at the beginning of everything.
The void at the beginning of everything is not something specifically mentioned in the Light Novel yet. We have proof for the existence of this void and inferences about its nature. You basically know everything you need to know, you just might not have seen some of the scans, that's all.