Mana core, though the size remains the same from the beginning till the end, the mana stored within could be immeasurable, if not for the so-called ranks the populace are introduced with.
These ranks not only measured the quantity of the mana on a approximation, but also its quality, thus graded from E to S, then [Semi-Deus]—later, [Lesser God], [Higher God], and [God] ranks, while not so creative these ranks were simply self-explanatory.
Though the rank [Higher God] made itself seem as if it were above [God], it wasn't so in the least, even then it was named as such to remind the ignorant populace that there existed nothing above the term [God]!
With the mana stored with the core of a [Lesser God], one could scale everything within—e.g., the Kingdom of Zazia; but there also remained a fact that it wouldn't be as clear as the skill [Mana Sense] which allowed one to sense everything—including a strand of grass, if in range, which was set to a kilometre at max.