What now?

My fingers pressed on the stones. Held tightly by my palm, those fruits of magical ingenuity and technical expertise came to life. 

In each of my hands, I held three stones. The types of those tools also matched. And with my own energy serving as the additional supply for the spells ingrained in those gems, an apocalypse came.

But this time, not for the humans.

Instantly veiled with a sea of flames, the monsters couldn't react at all. In less than a second, several soccer fields worth of monster's army got scorched, turning into a veil of ash. 

This effect could be achieved thanks to exactly three different stones. 

While I was out exploring the dungeon and setting the entire show there, Sander didn't slack of. With most of his initial ideas confirmed, he hired a huge group of fellow craftsmen to bother with the necessary groundwork.