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I love the theme. Seems super creepy and having your units feed the abomination seems super cool. 
I just can't figure out what's happening in this mission, from deployment to end game. A lot of polishing is needed here.

The mood board is ok. I love the title image.

I love the theme, not gonna lie. And not gonna lie, this needs some polishing considering the notation. What concerns me the most, is the "Part of the core" rule, which states: "Whenever a player unit takes a wound roll one die and apply the effect...", then the table below states that on 1-5 you remove a model from that unit. How do this applies to models with Tough(X)? Tough(X) states that such model needs to take multiple wounds to be killed. And the table as is, implies that it's a one-hit-kill.

I love the theme, not gonna lie. And not gonna lie, this needs some polishing considering the notation. What concerns me the most, is the "Part of the core" rule, which states: "Whenever a player unit takes a wound roll one die and apply the effect...", then the table below states that on 1-5 you remove a model from that unit. How do this applies to models with Tough(X)? Tough(X) states that such model needs to take multiple wounds to be killed. And the table as is, implies that it's a one-hit-kill.

Concepts & Originality

Moodboard is ok.
Flavortext is a bit long, but is ok. 

Rules Clarity
There are many rules but they aren't superfluous this is very nonstandard as far as game preparation goes. 

I don't understand the deployment within 6" of each other. A diagram would have been good.  

I don't understand how to create the abomination or how you add units to it. 

Adherence to Theme
An ever-growing abomination is on theme and pretty cool.
But I don't understand how it works.

Some general feedback —

• "each containing one unit combined with a hero" — is the intent here that each army contains only that one unit? If so, that could be explained more clearly; I only realized this might be the intent upon reading the rules for the Abomination (up until then I thought this either meant only one of your units may have a hero attached, or at least one unit must have a hero attached).
• If the above is true, then I'm worried that players simply taking turns activating their one unit might easily devolve into a somewhat boring case of "rolling attacks until something dies". Which, by the way, might happen very quickly — whoever first fights the Abomination in melee is likely going to get like 50 attacks in their face which is at least gonna put them at risk of routing, if not an immediate wipe-out. Since most models it kills are probably going to get added to it, this would almost certainly lead to an exponential power increase that will make it effectively impossible to destroy the Abomination.

Also some minor notes —

• "All the players must collectively decide on a single starting location. And must be deployed within 6 inches of each other" — how large an area should this "starting location" be? Also, if all players share a deployment zone, the note that they must deploy within 6 inches of each other seems redundant (as well as somewhat unspecific).
• For the core of the abomination, I think it may have been more elegant to define the unit's stats in the mission itself instead of referring to an existing unit from an army book. Getting to pick a unit also means a lot of possible variance with the challenge: a Tough(6) Bat Beast or a Tough(12) Giant God-Statue will come with very different difficulties, and some such units might come with special rules such as Caster that the mission doesn't tell you how to handle.
• The Part of the Core rule doesn't account for the fact that the unit might have Tough(3); should probably trigger when a model would be removed, rather than when taking a wound.