Vile Evil Hides Under The Veil

Siren's Sanctuary's underground facility.

A day later.

Eren opened his eyes and sat straight up on the runic stone platform. He smiled to himself, knowing that the experiment had succeeded.

"Let me see my progress," Eren thought to himself as he tapped into Menaka's Blessings to summon a Spectral Screen in front of him.

[ Menaka's Blessing: Special Pact ]

[ Name: Eren Elijah Idril ]

[ Human (?) / Half-blood (?)]

[ Origin: Anfang ]

[ Current World: Labh Salem ]

[ Current Location: Sunhaven. Kingdom of Eldorath. Joravar Continent. ]

[ Path to Power: Mana Core Harnesser / Ranker ]

[ Mana Core Status: A-Rank Solid State Perfection (S-Rank breakthrough event has been forcefully suppressed) ]

[ Ranking Status: Grandmaster / Grand Knight ]

[ Special Status: Demi-god, Elder Seed, True Inheritor of Elder Ichor's Divine Throne, Demon Slayer ]

[ Divinity: Edict Over Water (elemental), Sin Series Divinity (abominated) ]

[ Tantra: Rootless Tantra ]

[ Current Affiliations: Ishgaar's Temple (non-restrictive), Kaisaayan Demon Slayer Corps, City of Sunhaven ( approved masked identity, non-restrictive) ]

[ Confirmed Kills for the Corps: 4378

Confirmed Mission Completions: 376

Confirmed Mission Success Rate: 85.62%

Current Demon Slayer Rank (Grand Knight Ranking): 69 ]

[ Base Attributes:

Vigor: 740

Mana: 740 x7 (5180)

Endurance: 740

Strength: 740

Dexterity: 740

Intelligence: 740

Spirit: 4444

Faith: ????

[ Active Profession: Runemaster (Varied) ]

[ Passive Professions Available: Close Combat Warrior, Summoner (Varied), Berserker, Assassin, Ranger, Potioneering Warlock ]

[ Greater Skills: Domain of Wrath, Domain of Gluttony, Domain of Lust, Domain of Pride, Domain of Greed, Domain of Envy, Domain of Sloth

Unique Skill Evolution Path. Strengthened by the Virtue Series Marks, New Skills and Greater Skills Can Be Unlocked Over Time. ]

[ Bloodline Skills: Memory Extraction, Expedited Regeneration, Life Drain, Devour, Shapeshift, Partial Shapeshifting ]

[ Inherent Skills: Instant Reset, Unlimited Weapon Works, Potioning (varied), Hero's Heart, Demi-god's Gaze ]

[ Equipment:

Elder Seed Artifact– Shallot's Mirror (Wielder-defined name) (Always-active state)

Elder Seed Artifact (?) – Reen

Elder Seed Artifact (?) – Shura ( Contains the Demon Soul Fragment of Samael (Demonmir). Inactive ) ]

[ Currency Available:

Menaka's Runes– 563,865 (Recent History: 10,000 Meroons Credited by Jivem

Onianum's Direm– 88643

Extols (Anfang)– 67312946 (unusable in Labh Salem)

Jolan (Echidna)- 4775 (unusable in Labh Salem) ]

[ Personal Storage Access: Granted– 300 Out of 300 Slots Used ]

[ Communication Access: Granted ]

[ Menaka's Market Access: Granted ]

***

"Sevenfold increment in the mana reserves! I... I really did it."

Eren murmured to himself as a smile bloomed on his face. He felt as if he could take on three Eliza Samaels when the witch was at her peak in Anfang with the power surging within him at the time.

Unlike in the case of prisoners who were used in past experiments as "guinea pigs", Eren didn't need to summon all of his seven pseudo-avatars to one place. He just needed to use the Mesh and the way it facilitated his connections to the pseudo-avatars to his advantage.

The Mesh was a form of ultimate connectivity. It could be used as per one's wish. However, most practitioners only made use of its basic functions. It was only Eren who had decided to use the Mesh in such a unique way.

Eren also had to agree that without him practicing the Rootless Tantra to strengthen his body, he wouldn't have been able to wield the sevenfold mana core to its fullest potential. After all, a vessel needed to be capable of handling the pressure that came with the sevenfold increase in mana reserves.

If it was his old body, he would have definitely gotten hurt from time to time while wielding that much mana reserves within him. And this was already the best-case scenario.

With the sevenfold mana core, Eren could use any of his Professions without burnout. He could switch between them more freely. With this freedom came an ultimate form of battle-centric adaptability.

The increment in the mana reserves did not only increase Eren's battle potential. It was bound to have a profound impact on the way he conducted his experiments or honed his crafts in various fields.

For example, Eren also needed to exhaust all of his mana reserves from time to time to conduct some experiments. Some of these experiments needed to be expedited with a greater chance of generating errors because Eren had limited mana core reserves at the time.

Then there were mana-reserve-based limitations that needed to be considered for Grandmaster-ranked potion-makers and artifact forgers. Some Array Formations or Battle Formations could also not be utilized to their utmost potential for prolonged periods.

However, these limitations could be pushed to an abused level after Eren increased his mana reserves by almost seven times. Under the right settings and resources, Eren could start producing S-Rank potions and Hex Artifacts with his current mana reserves. These limits would be pushed even further when he actually broke into the S-Rank.

All of Eren's unique advantages would be multiplied even further if and when he managed to unlock the sevenfold mana core with S-Rank tier mana.

Of course, Eren had considered all these advantages when he started working on this project. He would be able to upgrade his skills in myriad fields with this single boost alone.

***

This was not all.

The butcher could also let this ability be used by one of his pseudo-avatars at a time. It meant that one of his pseudo-

avatars could wield the sevenfold mana core at any given time when Eren wasn't using it for himself.

Although the pseudo-avatars' bodies might not be able to sustain the pressure of the sevenfold mana core for an extended period, their chances of survival during critical times had been raised to their highest values after Eren unlocked this unique perk for himself as well as his pseudo-

avatars.

It could allow the pseudo-avatars to deal with their enemies at the very last moment when they least expected them to.

Replenishing the sevenfold mana core was a lot easier than one could imagine too. All of Eren's pseudo-avatars could combine their efforts to replenish the lost reserves. A unique synergistic effect would be formed among them as they helped each other and managed each other's mana reserves through the power of the Mesh.

Eren got up from his position and started walking towards the exit. "It's time to go and say hi to sea god Raashim," he said to himself before disappearing from his position with a flash of lightning.