As for why it's not hexagonal...
It all boils down to the disadvantage of not being able to fly and lacking long-range means.
"It can freeze most energy attacks. Just this fact is very unfriendly to witches...
Most witch attacks are long-range spells, and they mainly involve energy.
To break through this limitation, either the spell speed must become so fast that even the Beast King can't react, or use physical-based Joint Spell...
Forget about the Fire Series. Even if it could explode near the opponent, it would be instantly frozen with no time to unleash its power.
But the current research into physical spells is almost zero, let alone to the extent needed to kill a Tier Six Mutated Bear with a strong physique.
And when it comes to speed, there's only the Light Element, which hasn't been researched much.
Moreover, the Light Element is inherently lacking in Attack Power, and the Thunder Series, which can cause enough damage, might be detected and frozen...
