Upgraded skeleton

The zombies continued to congeal together until they came together as one single mass of dead flesh.

What the golems were was a mass of dead flesh that was bound together by the dark energy in the first place. So that was why the method of creating the golem involved smushing all of these zombies together.

Once the zombies were together, the dark energy that had been under them suddenly came up and completely covered them.

This dark energy seeped into the mass of dead flesh and almost seemed like it was nurturing it. With the dark energy seemingly strengthening the mass of dead flesh, it didn't take long before the seams that were there slowly disappeared.

It was as if the mass of dead flesh was coming together as one single thing.

The dark energy that was used to create these masses of dead flesh wasn't as strong as the dark energy that was used to create the Death Knight, but the golems were terrifying to look at compared to the Death Knight.