CITADEL - The Builder

3) It feels very inorganic toward the end when Black pauses on the stairs while everything is collapsing behind him. I think it'd make sense for him to keep running up the stairs...
...Or perhaps at least turn around to watch the carnage in awe.

2) The over-the-top evil laugh felt out of place to me. It strikes me as incongrous with the rest of your world-building, but my bigger concern is that it's also a repetitive sound sample. When it gets played three times in a row, it's noticeably canned.

1) The animation is just a little stiff -- it stood out to me that the Builder sometimes gestures by moving only his arm, for instance. A subtle adjustment of his hips and shoulders would help a great deal to make these moments feel a lot more natural.