Even though the distance made it impossible to capture specific details, just the sight of that dense arrangement, which was so overwhelming it caused discomfort, was already incredibly shocking.
Sanders stared silently for a moment, "It seems that infiltrating Black Castle without alarming these undead won't be easy."
Difficult, but not impossible.
For instance, Angel could use the "Gate Model," or Sanders could employ the Nightmare Substitute. Both had a chance to enter Black Castle. However, the castle seemed quiet for now, but who knew what the situation inside was? If it were peaceful inside and they used Spell Techniques to enter, it would be tantamount to an invasion without declaration.
Sanders thought for a moment, "Let's resolve the issue with Popota first, then I'll see if it's possible to contact someone from Black Castle."
Angel nodded in agreement.