The domain doesn't needs follow the rules of JJk entirely you can decide your own rules for how it works.
http://powerlisting.wikia.com/wiki/Special:Random
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https://powerlisting.fandom.com/wiki/Cold_Attacks
My domain would generate 3 Dragon heads which shoot beams of cold energy which freezes and shatters anything they hit, following JJK rules these attacks are unavoidable but there is an escape route so it’s as big as Sukuna’s domain.
https://powerlisting.fandom.com/wiki/Thermal_Empowerment
Ryōiki Tenkai-"Netsu-ro"(Thermal Furnance), in my domain full amount of thermal energy give me more power, if enemy body will warm up, this temeperature will not decrease, will only rise which cause body to use calories and curse energy to keep this heat, the more you fight/move the more warm up your body which will burn you more energy to keep heat, the enemy will lose from heat stroke/dehydration/zero calories/zero curse energy.
Ryōiki Tenkai- mugen no chou dan. In my domain, all my attacks, be it a bullet, a rock, even my enemies' attacks will ricochet throughout the domain and the momentum will increase infinitely as long as the domain is active. You can say it's like a bullet version of Sukuna's domain. Instead of slicing, we shooting.