"This ice system is a procedural system made using multiple nodes, as you can see.

The thing is, most of the ice systems I see made by other artists are mostly texture-based. They use bump and displacement textures to create the ice details, and they look pretty good. But the problem is that they can also make the system heavy. They also look good in Cycles, but not so much in Eevee.

So, here is where this system comes into play. The basic body or outer surface of the ice is just a simple glass material, which works normally in Eevee with refraction.

Now, there are multiple types of ice, like clear, dirty, salty, etc. These types define how much internal structure or detail is visible inside the ice.

For that, some particles are distributed inside the cube or any other geometry. Then, icospheres are assigned to those particles. On those icospheres, multiple cones or triangle-like shapes with different sizes and widths are placed randomly. This gives the ice some random, sharp, and pointy structures inside, creating that crack-like effect.

Then, using another set of particles with some displacement, bubbles are placed inside the ice. These bubbles also get some random transformations and noise to make them look more natural."