Fight with Eternal (part 1)

At the very top of the mountain, there was a marble arena covered with moss and other vegetation making it hard to notice at the first glance – what wasn't hard to notice was the monument right behind the arena – a massive opaque builder that looked so out of place as if it didn't belong into that world at all – a half-digital, half material structure that was already riddled with crevices and the spiderweb-like cracks that let out an enormous amount of red and black light all while giving off horrifyingly overwhelming energy.

"...is this it...?"

Roan felt Mary clinging to him in distress and so he turned to the light-brown-haired priestess and asked pointing at the crumbling builder.

"The seal of the Eternal – so that how it looks while it isn't inside of the blue undead..."