Stronghold 12 was a marvel of resilience, a massive dome constructed from the most durable materials known to Astrid's engineers, spanning several kilometers in diameter. The dome's cover was made of transparent glass, tempered to an extraordinary degree, its surface infused with mana to make it virtually unbreakable. Even a god-rank being would find it extremely difficult to shatter, the glass's properties enhanced to absorb and dissipate immense force, rippling like water under impact before returning to its flawless state. The walls of the stronghold dome were equally formidable, towering several meters high and thick, reinforced with layers of alloy and mana weaves that had withstood countless assaults since its completion. The invaders had tried repeatedly to breach them, their attacks rebounding harmlessly, leaving only faint scorch marks that faded over time.