Too much darkness energy and the deformed metal would turn into a puddle, deforming the coin beyond Lith's and Solus' current ability to fix it and earning them a fresh start.
It took two days for Lith and Solus to complete the lessons and when they did Menadion introduced them to an even greater challenge.
"Congratulations! We are almost done with crystals." She handed them Adamant coins with blue crystals and once those were successfully Dismantled, she replaced the Adamant with Davross and the blue crystals with violet ones.
"No!" Lith cursed in all the languages he knew. "Fuck, no! There is almost no healthy metal left. Due to the Davross' high mana conductivity, the violet crystal has formed a small but complex mana circulatory system by itself!"
"It sure did." Menadion said with a smug grin on her face. "Don't get too excited. Wait to see what a white crystal does. That will truly put your sanity to the test."