In this world dominated by Magic, energy-matter conversion weapons hold a tremendous advantage in situations with unclear intelligence.
Firstly, before actual detonation and when paired with a special anti-magic alloy casing, they can achieve zero Magic Power fluctuation emission, thereby deceiving all Defensive Magic Arrays triggered by Magic fluctuations.
Secondly, they can function within an Anti-magic Field.
Anvis previously used a third-generation Mushroom Bomb to obliterate the Church Court's Half-plane, precisely utilizing these two key advantages.
As a secret base, the entrance to the Church Court's Half-plane would certainly be heavily defended, with measures like Anti-magic Fields, Magic Restriction Arrays, etc., to prevent infiltration by enemies.
But the designers probably never considered that there would be such a strange weapon with no Magic fluctuations before eruption and with destruction power that is virtually unlimited.