Single post in All About Deltas

It is my understanding that any/all effects on an egg Resolve at the time of Hatching. That applies to Everything on site - including such things as party position, any/all applicable bonuses, both temporary and permanent, etc. Another way to look at it - think of the Coding Complexity required to assign and maintain a delta factor for each and every delta'd egg until it is hatched vs. simply checking what the V~Wave is when a delta'd egg is hatched and assigning one fifth to that type's chances.

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<edit - though I agree that, to my knowledge, Niet has not yet addressed this point specifically in regards to hatching deltas>