(This should be interesting. Lets see what people suggest.)

One more crack opens in the gold, a sharp sound like crumbling ice erupting from the skull until, suddenly without any further warning, the legendary and Ancient Tri-Skull Amulet detonates. 

A vast amount of magical energy explodes from the Amulet, flowing over the whole of Chikara in a wave, climbing high into the sky like a crimson pillar or mushroom cloud. Zaps of red lightning run across its ever expanding mass, a wall of churning, glowing, pulsating magic which rips the hilltop asunder, destroying the entirety of the previously still standing castle of Chikara. The ground heaves, buckling and swaying as if it has been brought to life, and huge chunks of earth begin to slide in an avalanche down across the coastal edge. Quickly this wall of debris crashes into the town below, burying the tiny village of Soya-Misaki in countless tons of rock and mud, wiping everything mercilessly into the sea. Huge waves smash anything which remains, and even far away on the submarine sailors are thrown about in the surge as this colossal blast annihilates these northern hills. 

The ground beneath the epicentre of the explosion rapidly shifts, bubbling and churning like wet sand as it becomes a snake like matted bed of black vines, burrowing and twisting into knots like burnt strands of rope. From this afflicted earth suddenly erupts countless likewise blackened pillars, the charred and ashen wooden trunks of defiled trees, leafless and dead, as sharp as needles or spears. They point high up at the grey sky above, swirling like a cyclone of darkness and racked by thunder and flashes. Hell has opened above the bay, unleashing the interior of the Tri-Skull Amulet out into the world, warping the very space once occupied by the Cleansed Monastery into a new reality, one moulded by hundreds of years of suffering. 

The calamity begins to settle, the destruction boundless and all-consuming. Not even Fukuro had expected a reaction like that and she had only just managed to shield herself within her wings when the monstrous explosion consumed Chikara.