Angel quickly deduced the limitations of the Door Model from the information already available.
Once Angel used this new Door Model, the special energy contained within it would return to zero.
In other words, after Angel cast the new Door Model, he would have to wait for the special energy within it to diffuse and replenish before he could use it again.
Angel did not know how long it would take for the special energy to spread from zero to full.
But this limitation undoubtedly told Angel that this new Door Model was best not cast casually.
Moreover, this restriction on its use was only what Angel could currently deduce.
Beyond that, Angel could sense that the Door Model should have further restrictions. However, he could not yet deduce what those restrictions were. Only when he truly used it would they gradually reveal themselves.
For that very reason, Angel had originally intended to test the new effects of the Door Model immediately, but now decided to put it aside for the time being.
After all, no one knew how long it would take for the special energy to replenish next time. Testing it rashly now was not a prudent choice.
Returning to the spell itself.
Although the new effects of this Door Model came with many restrictions, Angel did not actually feel any regret. The greater the restrictions placed upon any spell—or, broadened further, upon anything at all—the more it indicated that the thing itself was powerful or important, and thus required many constraints to keep it in balance.
For instance, many highly powerful spells basically required supplementary casting materials before they could be cast. Those casting materials were, in fact, also a kind of restriction.
With that thought, Angel became even more solemn in his attitude toward testing the