Cryokenisis is based on thermo control.
Yes it can be dangerous but so can everything else...
This ability belongs to psionics and psionics is advertantly, an unpredictable practice. Dealing with any of those abilities must be done so with correctful knowledge and a good credible guide.
I suggest someone who uses it themselves not just someone who knows a great deal. Cryokenisis is a rather difficult ability to master and it is rather rare to find someone who has.
First off it is dealing with a subelement.
As known you have your basic 4 elements: fire, earth, wind/air, and water.
But what the subelements are- elements of nature that are created using any amount of the four main elements as just listed.
*Cryokenisis is the conrol over ice.
Ice = water and wind/air
Being this is strongly suggest going for the 2 main elements that have to do with ice(water & wind/air) meaning you should workj with Hydrokenisis and Aerokenisis first. Master those and Cryokenisis won't be quite so difficult or even yet as dangerous.