The final room was the twin brother of the first, having the same, uncontrollable desire to implode Cyrus's head through any means necessary.

All the issues began to reveal themselves just as Cyrus finished expanding the room to the proportions of a large cavern. He was about to start caving the walls and ceilings slightly outward to enhance the natural ambience when things fell apart.

As the dungeon core was methodically bending a wall, the brittle material snapped in two. The explosiveness of the fracture propelled bolts of jagged rock spikes into the air, flying in all directions. The roman's luck failed him. Due to the close proximity between his body and the launch site, all the debris rammed into him. He looked like a porcupine. The base of stone cones was visible across his back and down his thighs, some having their tips protruding on the other side. The thin titanium armour had shrugged off the smaller projectiles but seemed to have utterly failed in resisting the larger ones.

Pain, his long-time companion, came back to greet him with a crushing hug. Staying alive became the utmost priority. Cyrus constructed another metal box. This one was disfigured, wonky and leaning towards one side. The man then coated the insides with scraggly, rough cuts of healing runes before pumping the tank full of water mixed in with medicinal herbs. The clear fluid gushed from mid-air as if flowing from a gigantic, invisible pipe while leaves fell out of invisible trees suspended in the air.

The sight would've been almost comical...if not for the bloody, mutilated, metal porcupine conducting this strange magic while standing in an ever-growing puddle of blood. Even the most vicious of gladiatorial bouts would've paled in comparison to this soul-scarring sight.

After a few minutes of filling up his metal bathtub, Cyrus fell in, limbs flaying randomly. His brain had lost control over the body, too occupied with keeping the insanity-inducing pain at bay.

Floating in the cool, cosy substance, the man removed the tattered remains of his armour and clothing with a wave of his will. After a long pause, the roman moved on to expelling the stone hijackers from his body, ripping each one out with great effort, teeth clenched, muscles trembling. The water turned blood red.

Half conscious, half deceased, the deathly-pale figure soaked in the herbal water for days in a state of partial drowning. Wounds slowly sealed, leaving pink, unmarred skin. Within a couple of days of this treatment, Cyrus fully recovered. Time to get back to work.

Conjuring a set of undershirts and equipment, the dungeon core was ready to go. Yet pain struck at him with every step, forcing him to plant his foot delicately on the ground lest the vibrations reawaken the dormant, phantom pains. The man arrived at the construction zone.

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Absorbing the debris and gluing the rift shut, Cyrus moved to the next one, adding extra mana reinforcements to the middle segments. There were no more incidents with the walls. But he wasn't out of the woods yet.

The next step was to sink large sections of the floor to make a suitable lake bed. Cyrus ate the unwanted sections, leaving only a few scattered pillars standing high above the floor. The lake began to fill. The molten liquid appeared in mid-air, falling downwards. It started slow but ramped up in speed as the ground drew near and gravity's hold grew tighter. Steam hissed from the pools of molten rock. Within a few hours of this process, the entire room had been covered with only a few rock platforms peaking above the lava.

With the second part complete, the dungeon core re-summoned his [Fire Elemental Golem]. The massive giant could've been mistaken for a distant human relative if not for the magma coursing through his body, dripping from exposed veins. Cyrus frowned as a faint memory stirred, something related to bosses. Latching onto this clue, the man dashed to his library, saluting the standard as he jogged past.

The human ran his finger down the spine of books in search of this topic, eyes flicking from one title to another. Within a couple seconds, his hands grabbed a thick tome, "Dungeon's Guide to Bosses!" Infusing his will into the pages, Cyrus was able to pinpoint and extract the info without even opening the book. Placing the guide back on the stone shelf, the dungeon core sped back the way he came, his hands crafting a Corona Aurea, the golden crown. A small smile played on his lips as he reminisced, tracing his hands along the familiar yellow frame, feeling the comforting weight.

Arriving at the sight of a giant golem relaxing in lava, Cyrus cleared his throat and gestured for the newest officer to take a knee. The mountain of rock nodded and rose from the lava with surprising agility, stepping into a lunge.

Unable to reach the head, the Decanus left his fleshy avatar and drifted upwards, surrounding the crown with the same levitating power. Finally arriving beside the massive head, the dungeon core grabbed the crown with his invisible hands and gently placed it on the spot where hair would've resided.

The crown began to melt, the edges drooping. Golden tears streamed from the crown as if in pain. Panicking, Cyrus enveloped the award in his mana, carving small regeneration runes in the sides. The coronet regained its former glory, standing tall and proud as the heat surrendered to the power of magic. Placing his hand on the molten surface, the dungeon core announced "I hereby declare you as Prometheus, Boss of the first floor!"

[Congratulations! You have created your first boss: [Fire Elemental Golem] Prometheus - Level 15!]

[Congratulations! You have completed 2 dungeon rooms:

1. [Unnamed]! 10/10 Mobs 25% Environment Durability

2. [Unnamed] 1/1 Mobs 100% Environment Durability]

[Would you like to name [Unnamed] X 2?]

Y/N

[Congratulations! You have completed your dungeon [Rank I]! The dungeon has automatically opened to the outside world!]

[Current Adventurer Count [0] - [0<10] Multiple Instances: [OFF]]

Cyrus's mouth hung open, eyes scanning and re-scanning the words to gleam some semblance of understanding. Questions whirled in his head, "What are [Multiple Instances]?"

[Multiple Instances are a series of mini-dimensions created inside your dungeon to ensure that each Adventure Party is kept separate in their delving.]