The Invincible Full-Moon System

"My gift for both of you", Rex said while handing the two orbs.

Edward got the scorching hot orb that even himself who is a Fire Elementalist can feel the heat from the orb, he holds it in awe as he has never seen something like this.

Kyran also got the dark orb, his hand instantly feel cold upon touching the dark orb.

The cold that he felt is not the ice-cold that he usually feel, but instead, the cold penetrate his insides as if he got pulled into everlasting loneliness.

Both of them look at Rex at the same time with the same confused look.

Until this moment, they can't quite grasp the situation they're in and they still don't know what these orbs are for.

"You both will absorb that orb during our training here", Rex instructed.

He then added as he turns to his back, "The absorption is just like absorbing Elemental Stones, so Edward you will teach Kyran first before you absorb your orb"

"Where are you going?", Edward asks seeing Rex heading towards the door.

Hearing this, Rex smiles before he said, "Me? I'm going to train too of course"

After saying that Rex left leaving Edward and Kyran who are frozen in place, they are still quite shocked by the event.

About two minutes passed, and Edward finally come to his senses.

He looks at Kyran who is holding the dark orb in his hands, "Alright I don't know how Rex got this, but I trust him that it'll not harm us", he said assuringly.

Hearing this, Kyran nodded his head a couple of times.

But when Edwards looks at the dark orb on Kyran's hands, he still hesitated for a moment.

Especially when the dark orb spat dark tentacles towards Kyran's hand as if it's trying to swallow him, and he must be out of his mind if he finds it hard to believe that this is not dangerous.

"Sit down in a meditative position, and put that orb between your hands", Edward said.

Kyran follows what Edward said nervously,

He sat down in a meditative position and held the dark orb between his hands, he can feel a slight change in the dark orb's surface.

It didn't feel the same as before, almost as if it's reacting to him.

The first time that Rex handed the dark orb, it felt heavy and chaotic but now the concrete surface of the dark orb changes into a strand of energy little by little.

Edward notices this occurrence too, the dark orb is turning into energy.

Or to be more precise, Dark Mana.

"Close your eyes and try to feel the energy in your hands, and if you're ready slowly think of absorbing the energy into your body", Edward added while he kept monitoring Kyran.

If something wrong happened, he will instantly yank the dark orb from Kyran's hand.

After hearing what Edward said, Kyran do exactly as he said to.

Edward saw the dark orb slowly turn into dark mana as it seeped into Kyran's body, the movement is slow and precise.

The dark mana started to engulf Kyran's body, his skin turns black because of it.

But then suddenly, "RAAARGHH!!!", Kyran shouted in pain.

His scream was so loud and agonizing that even Edward got shocked, the pure pain and agony that Kyran felt can be heard clearly from his scream.

Edward saw bit by bit, chunk by chunk, Kyran's body got consumed by the darkness.

Although Kyran is also a Werewolf, his regenerative ability can't keep up with how much damage the dark mana caused to his body.

Realizing that the situation turn dire, Edward hurriedly grabs the dark orb.

He planned to yank it away knowing that Kyran's life is threatened, but then, something unexpected happen.

"Huh?", Edward mumbles as he looks at the dark orb.

He realizes that he can't pull the dark orb out of Kyran's hands, it was stuck in place.

After he tried to pull it off of Kyran, the dark orb instead started to spread onto Edward's body just like what it did to Kyran.

The darkness kept going onto Edward's body as Kyran's scream filled the room.

In a panic, Edward uses his other hand to try and pull back his hand that got engulfed by the darkness but the scorching fire orb falls to the ground in the process.

SWOOSH!!

Red scorching flame burst from the fire orb decorating the room in red.

Because of the sheer amount of heat that the fire orb emitted, the room turns red as the flame also went to Edward and slowly went to Kyran.

While holding in the excruciating pain from the dark orb, Edward widened his eyes seeing the flame slowly crept to him.

"Shit, Shit, Shit!", Edward stammers in a panic.

But when the flame reaches him,

TSS!!

"RAARGHH!!", Edward also shouted in pain as both elements collided.

Edward went through the same painful training with Rex during the military, and the military also train their pain tolerance to the utmost limit by all kinds of methods.

But even with this kind of training, he still felt the pain to be way above human limits.

Kyran and Edward kept screaming as both elements creates a spark of energy, both elements then slowly went inside each of their body like a snake.

BOOM!!

A powerful shockwave exploded from their body trashing their surroundings.

Kyran's body emits a horrifying amount of dark mana that makes the place chilly, while Edward's body burns with dark fire as it emits scorching heat.

It went on for a couple of minutes before the both of them fall to the ground.

~

Meanwhile,

Rex booked another room that he saw before, the room has two small bathing tubs of water that only fit one person per tub.

He decided to use the demon core to train in this time period.

Although it is tempting to start forcefully making his way to sixth rank, time is not on his side so he decided to use the demon core instead.

Rex approaches one of the tubs filled with water,

From a glance, the tub looks really similar to a jacuzzi but the water inside this one is special.

Faint steam coming from the water inside the tub indicate that it's warm, and the crystal clear water tempts Rex to get inside hurriedly.

The two tubs are placed next to each other,

There's a huge tree root on the wall between the two tubes, and flowing water on either side of the room coming from the tree.

After reaching the left tub, Rex saw a tube connecting the tub to the flowing water.

'The water came from the tree huh', Rex thought as he start taking off his clothes.

Rex didn't know what this place is for, he only asks if there's a bathing place for a VIP and one of the staff guided Rex to this place.

He forgot to ask the staff about the place but it doesn't matter.

After taking off his clothes, Rex takes out all of the demon cores that he has and puts them in front of him stacked with each other.

Immediately after, demonic energy filled the room.

But Rex already checked if the room is secure or not, and thankfully all of the VIP sections are very private and nothing he did inside will be known.

Rex then asks, 'System, How many should I use per session?'

<50 Demon Core per session for the user's comfort>

'Comfort? then what will happen if I use all of them at once', Rex asks again.

<The more amount of demon core the user uses, the more painful the process will be. 100 Demon Cores result in pain as painful as during the user's first-time transformation process>

Reading this, Rex was quite surprised.

The transformation process that he felt for the first time is very painful, and for it to be equivalent to just 100 Demon Cores greatly shocks him.

'I have 197, let's just do two sessions', Rex thought before he inspect the tub.

There's a button on the tub that he didn't know what for.

Because he's currently in a training palace that he knows very little about, Rex needs to be careful if he wants to use this place.

If someone manages to sense the demon core, it will be bad for him.

Rex pressed the button before suddenly,

Splash!

The water inside the tub got flushed out as new water filled the tub, Rex nodded his head, 'System is there a barrier to cover the demon core energy?'

<Do the user want to buy a Demon Suppression Barrier for 5000 gold?>

'5000 Gold?!', Rex thought ins surprise.

He then summons the demon suppression barrier description before he shakes his head, 'I don't need to seal a demon, I just need to cover this demon core until I finished my sessions'

<Lesser Demon Suppression Barrier for 1000 gold?>

'Cheaper', Rex thought in annoyance.

Although currently he still has a few million to dump excluding the ten million he saved for his spirit, it didn't mean he will pay the system easily.

<Miniscule Demon Suppression Barrier for 200 gold?>

'Yes! that one!', Rex thought as he buy the last barrier from the system.

After getting the barrier, Rex dumped 100 Demon Cores in the tub.

Just after he dumped the 100 Demon Cores inside the tub of water, the crystal clear water turns black right after one dumped.

The demon cores dissipated merging with the water, the hundred demon cores then vanish.

The now black water even bubbles more than the water before, and it looks toxic.

But Rex trusts the system, there's no way the system would screw him like that.

He then placed his hand above the tub of water before a red barrier covers the tub of water before it goes invisible, it was the barrier he bought from the system.

Rex then jumped into the tub as the black water splashed because of it.

<Useable Demon Energy Detected!>

<Absorbing the Demon Energy>

<Processing...>

Upon entering the tub, Rex's body suddenly went stiff as the pain is exactly like what the system warner him from before.

He sits in a meditative state in the tub of water that engulfs his body all the way to his neck.

Because of how much he transforms, Rex already got used to the pain so the pain should be fine but there's one problem.

"Arghhh!", Rex grunted as he felt a stabbing pain in his stomach.

The stabbing pain came from the gunshot wound that he got from the Green Messenger, it still hasn't healed yet and Rex can still feel the pain until now but he held it.

But now, the water filled with demon core started to attack his wound area.

Rex gritted his teeth trying to hold in the pain, but the pain is more than he can handle just like when he first touched a silver as a Werewolf.

The veins all over his body bulge madly, and Rex can't even lean because of how stiff his body currently is.

If there's someone looking at Rex from the side,

Rex can be seen sitting in the middle of the tub filled with black water stiffly, and the black water got absorbed by his body slowly as the water got lesser and lesser.

All the way through the process, Rex kept grunting in pain.

He's greeting his teeth so hard trying to hold in the pain, but the pain is just too much.

"Rrrrgghh!!", Rex grunted.

This process kept going and upon hitting the twenty-minute mark, the water is already lessened so much that it only reaches his navel.

And it didn't take long before a notification appeared,

<Absorbing Success!>

<Calculating Result...>

<Obtained 50 Endurance Stat>

<Obtained 20 Strength Stat>

<Obtained 18 Agility Stat>

Looking at this, Rex smiles in surprise because of how much stronger he got.

These stats that he get from one session of absorbing the demon core got him more stat than leveling up by 5 or even more! It's simply astonishing!

After knowing how beneficial this process is, Rex goes out of the tub while feeling his body.

Rex can feel his body more rejuvenated and certainly stronger based on the system, and the demon energy that he absorbs vanish.

Not a trace of demon energy can be sensed from him.

This means that the system converts that demon energy into his own power, it may be impossible for Rex to do this without the system.

"Alright, let's do the next session", Rex said with a smile.

He presses the button again as a new batch of crystal clear water appears, it filled the tub full again just like before.

But just when he's about to dump the rest of the demon cores,

Rex suddenly senses someone is approaching the room, he instantly put back the demon core into his inventory as a person came inside the room.

The person hums beautifully but stopped upon meeting Rex.