The inferno dents refer to the polar regions of The inferno.
Due to dark matter mainly form clumps at the poles of The inferno, space here is distorted, forming dents of diameter 1.28x1012ly. In addition, the dark matter twist the space into a möbius band.
The unusual geometry of the polar regions favours the formation of turbulent storms such as plasma storms and lava showers. In addition, radiation soared to dangerous levels, which is hazardous to ships traveling within.