Crystallize Effect will make the enemy unable to move, use skill and use any healing items for a few seconds base on my official pRO account. The "WL_FROSTMISTY" is completely wrong. That's only a temporary and it will not give you freezing status effect, instead it is a crystallize status with snow flakes on your head like Diamond Dust.
For a hint, try to use the diamond effect status converting it into a script. Ask Cydh for this.