The Sphinx's opinion on his worthiness was as yet unknown as it blinked at him slowly, its face still unreadable. Wanda had listened to their exchange with her fists clenched because even if she had an idea of what to say, she didn't think he did. Mythological beings fell into the realm of things Tony Stark had a distinct dislike for. Wanda could commiserate with the Sphinx.
"You will pass, Sorceress," the Sphinx told Wanda and it shuffled out of the way of the doorway but stopped right in front of Tony, blocking his path. "You will prove your worth, Iron Man."
That probably meant a riddle, which was actually a relief because Tony was logical, he'd figure it out. Which wasn't to say that Wanda just going to abandon him here, both because she didn't know what was in the darkness on the other side of that doorway and because they'd come into this together and, no matter how they felt about each other at the moment, they were leaving here together. Wanda remained still and crossed her arms, the Sphinx was indifferent.
"There are four brothers in this world that were all born together," it began its riddle, its gaze on the Iron Man's face plate, staring as though it could see right through him. "The first runs and never wearies. The second eats and is never full. The third drinks and is always thirsty. The fourth sings a song that is never good." Finished, it waited, dispassionate.