Drows and Drider
Somewhere on the 3rd Floor, deep within the forests, in one unassuming cave.
The forests of the 3rd Floor were enormous, filled with huge trees, reaching even several tens of meters, filled with various flora and fauna, as many species of the Magical Beasts were roaming around, hunting for the food or the pleasures of it.
From the outside appearance, the entire cave looked rather ordinary, just like tens or hundreds of them were across the entire 3rd Floor. It was even well hidden, to the point, that one would have the problem of noticing it naturally without the help of any magic or ability.
Though, when one entered inside, he would be shocked to see how the vast difference was inside.
Thousands, if not tens of thousands, of Monstrous Spiders and their various subspecies were running here and there through the vast corridors of the cave system, all leading to the small underground area.