One of the sound effects I was tasked with creating was the sounds of the portals as you go through. I took the aesthetic of snow and ice quite literally and used a few recordings of ice being broken and cracking, as well as sounds of crushing glass. I also made a bed of inorganic/magical sound using some No-input mixing I did, trying to get a more high end feel to it as that’s what I generally associate with cold: sharp and clear feelings. After some manipulation (reversing, stereo widening, pitching up and down at various points I got something I was happy with overall.