Rule Contamination

Date- 15 April 2321

Time- 21:58

Location- Card World, Way Beyond, ????, Secret Hideout

The trait 'Rule Unity' was a very overpowered trait, let us take Cuth Diya for example. If he manages to gain this trait then he could comprehend the fire rule using the card world's rules and then continue his comprehension of the fire rule in the dark realm through its rules. 

Normally a demon or a card apprentice would not be able to do this because the rules of the card world and dark realm were different. This phenomenon was called rule contamination. Following the norms, once Cuth Diya comprehends the fire rule in the card realm his fire fule will be contaminated with the will of the card world. As a result, he can only continue to comprehend fire rule in the card world and not in the Dark realm or another realm for that matter. 

According to Dredre, this was purposefully done by the possessive realm wills such that their children do not leave them.