yeah i also gave up on the root quest it took me almost a whole week to actually make any progress, and the fact that everything will constantly fight you in the crystal caverns, not unlike other dungeons where smaller creatures will flee and get deleted when you step on them.
indeed, i got to floor 55 expecting that it would spawn in the upper floors, but nope. Also, is kinda easy to get there with the slime companion, Because it becomes stronger with each potion and there is a glitch that the potions dosent get used if in the companion's inventory but in combat they use it. Grow RPG: Infinity potions