While Remey recruited dwarves to carry her new slime poison toward the mine entrance. Su was hard at work in a completely different area away from where Remey had been experimenting. There was no way for her to know that Remey had just created a currently unknown potion to battle against the acidic yellow slimes.
"This child says they are thirsty and wants water," Onyx spoke to Su after having a short conversation with a little dwarf boy that had been burned on the throat by the acidic slimes acid. Unfortunately, the boy had worn a metal necklace the slime had attached to, therefore, causing the injury that stopped him from speaking.
There were many similar acid burns that the dwarves had suffered due to their many metal tools and accessories. It was all too common in their kingdom to adorn themselves and give each other gifts with rare gems and metal in them. It was just part of their life as crafters.