a bunch of REALLY good stuff.

Let’s go worst to best.

Fame: An imaginary item that you gained by gaining fame or infamy across the lands. It allowed you to do things like upgrade your new plot, or add things to it.

XP: A measure of how well you were doing in the world. Gained by completing quests and killing enemies.

Room Elements: A random object(or element) that goes into a room of your dungeon to improve the residents’s quality of life, stop adventurers, etc.

Essence Crystals: A condensation of a single element(a type of magic, ranging from simply water to mechanic) in the form of a crystal. It can be used to affect a weapon, item, room, trap, or even entire dungeon with an element.

So basically, you had a new unit of wealth to play with, you were closer to leveling up, and had two new things to spice up your cave with? Pretty damn nice!

Wait a moment. Just how close were you to leveling up? You pulled up your Stat menu.

Dullahan-Slime LVL 2
Monster, Dullahan/Blue Slime, NPC, Explicit
LVL Up: 220/200 XP
Sleep to LVL up!
ATTRIBUTES
Strength 14, Dexterity 30, Endurance 20,
Charisma 1, Manipulation 2, Appearance 50,
Perception 32, Intelligence 47, Wits 26
SKILLS
Sewing 23, Smithing 12, Reading 49, Adaptation 18, Trapping 40, Hunting 27, Cooking 34, Massacre 95
FEATS
Unholy Tome- You call upon a random necromantic spell from the tome that raised you. The spell's level is one less than your own.
Reap- You draw upon the powers of your class, charging your weapon with a life-stealing energy. The energy takes 10% of the victim's max HP and uses (Your LVL)% of it to heal you.
Monstrous Appearance- Your looks render you rather unpopular with non-monster entities. When trying to use Charisma or Appearance related abilities, you will gain a -20 modifier upon the effect.
Scent of ****- Your enemies begin to notice the stench of rot and decay. This decreases their attack by (your LVL/2)%.

So you needed to sleep to level up? And you could level up? That seemed like the current best course of action.