The abilities of the Skeleton Dragon King and the Giant Bone King overlap significantly, with one excelling in aerial combat and the other in ground combat.
On the ground, the former is hardly a match for the latter.
In the air, the latter cannot compete with the former.
The enhancement Gaven brings them is quite limited.
Because the Primordial Enhancement of the Soul Origin and the Soul Pool Purification Essence are ineffective on them, as the Plains of Bone had already enhanced them when they became Advanced Undead Lords.
Otherwise, how did you think their divine-level bone manipulation, Profane Vigor, Ferocious Momentum, and the +5 to all attributes of Advanced Undead Lords came about?
Apart from the three Divine Nature Blessings, the greatest boost to their strength comes from Amanda's Earthbound Ennoblement.
"Amanda, Earthbound Ennoblement!"
This is why Gaven places such importance on the Skeleton Dragon King, more so than the Giant Bone King.
