Transitory Beast Taming Pact's Hidden Effect

The Transitory Beast Taming Pact was able to feed Nadia with a type of energy she liked or... was it able to even know the type of energy she needed to grow? And so was able to automatically allocate the energy she is compatible with?

Davis wasn't able to tell just by looking, both he felt it has to be former or the latter. After all, the Transitory Beast Taming Pact seemed to be capable of using his soul's properties to feed Nadia without him knowing that it had an ability like this... 

'What else can this Transitory Beast Taming Pact Technique do...?'

Davis tried to manipulate the shelter to produce another attribute he possessed, and suddenly, the darkened shelter became filled with light!

'Holy!!!'

Davis became flabbergasted as he looked at the shelter that slowly changed from the dimly lit creepy room into a bright haze, making the shelter's surroundings sparkle as if the early morning sky of sunrise lighted it up.