At first, Alex didn't think much of the hard surface, as it was only another layer of the ground for him to go through. However, when he finally arrived next to it, his technique failed.
Alex couldn't go any further.
'Huh?'
Alex was doing his best to keep the Yin from affecting him, so it took him a moment to realize what was happening. When he finally understood, he frowned.
'Just what the hell is this?' he thought.
His senses had no answer for him at all. He tried to sense beyond the wall, but his senses were stopped right at the front of it. It couldn't penetrate through the opaque object.
There was no light for Alex to see, so he tried to feel with his fingers, but that gave him nothing at all. It felt smooth to his fingertips, slippery even. But he couldn't tell if those properties belonged to the wall or if that was caused by the slime.
Its surface at least was not rugged or filled with grooves. It was more or less flat and smooth.
