Followers of The Blood god.

"What is that?!" The man blurted out, drawing the attention of all the crew members on board, including Rollo.

Rollo let his gaze follow the direction the man pointed out. Raising an eyebrow in surprise at the scene that played out before his very eyes, he couldn't help but blurt out a curse word.

Right before their eyes, an ice road was being created on top of the ocean from nothing...

"Maybe it's a mutant beast?! Let's get away from here!" One of Rollo's followers said loudly. 

All of a sudden, the ice road stopped increasing length. The pause was so abrupt, one would think that whatever mutant creature was creating the structure had come to a stop because of them.

"Oh no!"

"We have to get away!"

"It must have somehow sensed us!"

Without even a moment of hesitation to think of the potential dangers ahead, Rollo gave the order to move closer to the ice bridge, completely ignoring the pleas of his men.