Among the tales that players can select are a collection with the devotion type. Each of these tales represents one of the pagan gods and describes how a character can commit to the virtues of that god and gain powers from that commitment.
In most ways, these tales are no different from any other; they follow the same structure and rules. However, one of the tier 3 talents in each of these tales is titled "Devotion to ...", and represents the ultimate devotion of a character to that god's morals.
Each of these devotion talents specifies three virtues that the god expects a character who devotes to them to exhibit; for example, Bathemos expects characters to exhibit impulsiveness, hedonism, and anarchy.
Should a character with one of these devotion talents fail to uphold the virtues of that god, the god will retract this blessing. What that means in rules terms, is the devotion talent (the tier 3 talent only, not any other parts of the tale) will be disabled - meaning the action cannot be taken, or the passive effect is inactive, until the god deems the character worthy again.
Ultimately, it is up to the narrator to determine if and when a character has crossed the line and is no longer representing the virtues of their god. There is no hard and fast rule, but consider the following levels of rebellious behavior:
Narrators may also wish to cut players slack for the sake of progressing a game or good group play; this is ultimately up to the group as a whole as to how strict these requirements should be.
Further, how much effort is required to win back a god's favor is flexible, and should fall under the rule of "whatever makes sense in the situation, and is most fun for the players and story".
A character is allowed to take more than one devotion tale, and can even take more than one of the "Devotion to ..." talents. Depending on the selected gods, this may cause a conflict, which might result in a character having a difficult time pleasing both gods at once. This should ultimately make for an entertaining story and gameplay, as the character tries their best to juggle potentially competing virtues.