If Iron Man noticed Wanda's private struggle, he didn't let on. The dark cube was still working incrementally downward, clearly with some kind of control, but Tony didn't see or hear any obvious mechanism at work that would carry its weight. He couldn't see much of anything, even with his multitude of repulsors to light his way, not bright enough to cut through the vast darkness in front of him until the block settled, smooth and seamless into the floor in front of him. There was another audible click, then a flare of light on either side of it, shooting up the walls and darting away from him; fuses lit, sparking all the way across the walls to the corners, then up the length of the room, giving him a sense of the true scale of this hall. It was massive, columns inside supporting the vaulted ceiling's weight ten feet across, at least seven of them even on each side all the way to the black pit of the far side of the room. The fuses darted inward in perfect symmetry to their launch point then fizzled out as they reached the doorway mirrored on the other end of the hall, darker still and only giving him a fraction of a second to meet the eye of what was waiting for them on the other side of the room.
For a beat, he was gripped by a panic that he had to blink away in this renewed darkness, more scared now that he couldn't see the thing than when he could. He had to recover with a roll of his shoulders before he remembered he could switch to night vision, and took Wanda's arm before she charged ahead and aggravated whatever that thing was. It hadn't made a move; still at the far doorway, staring evenly, like a statue. Was it a statue? Tony almost laughed, but he saw the heat roll off of it, and saw the tension in its throat, but it still didn't blink. "You see it?" he asked under his breath, as though he wasn't completely certain the thing could hear his thoughts. If anyone Tony knew had any idea what demon beast they were facing, it had to be the Scarlet Witch.