Dice?

As a matter of personal preference, which is described in detail in the "DMing system" section, I prefer not to use dice at all to determine success or failure of a character's action. Understanding that some of the participating players may prefer using dice to determine the effect of their actions, I will be using the dice system also described in the "DMing system" section for them, with one extra case that will be detailed below.

When describing the corruption system and the particular case of a priest or cantor attempting to remove a CP from a character, I mention that they use their own skill against the intensity of the corruption. The intensity of the corruption isn't another way to describe CP. It actually depends on the inherent powers of the dro-m'Athra and the willpower of the character undergoing the CP removal attempt.

While in all other cases, the dro-m'Athra's AR and DR will be determined by its player (through roleplay or die rolls), in this case in particular the DR will have a preset value of 13, reversely affected by the willpower of the character undergoing the CP removal attempt; if the character has high willpower, the final DR will be lower and easier for a priest or cantor to succeed; if the character has low willpower, the final DR will be higher and harder for a priest or cantor to succeed.

Willpower will provide a modifier to the DR as mentioned above, based on the character's level of the attribute, as follows:

1-3: +3
4-6: +2
7-9: +1
10-11: 0
12-14: -1
15-17: -2
18-20: -3

This means that the final DR that a priest or cantor needs to beat by dice will range from 10 to 16.