Infinity Mirror

'Now, this… is going to be a problem.'

Standing on the threshold, Sunny studied the long corridor. It stretched in both directions as far as he could see, bending slightly. The stone floor was smooth and even, while the tall ceiling was illuminated by a scattering of softly glowing gemstones. The turquoise gems were embedded into it, dimly drowning the corridor in pale light.

The problem was with the walls. 

Both of them were perfectly smooth and seamless, as if the corridor had been formed inside the mountain by some unknown means instead of being constructed. Much worse, their glossy surface was reflective… the walls of the corridor were like two endless mirrors. 

Remembering what Cassie had said, Sunny frowned. 

The blind seer inhaled deeply behind him. 

"Oh, my."

Her voice was somber.

Sunny hesitated for a few moments, then asked neutrally:

"Left or right?"

Cassie answered with a hint of confusion: