Demon Devil Lifespan

Biodata

Background / History

After Lu Chen slew the Vengeful Fox Evil Spirit, the system identified and absorbed its demonic lifespan. This revealed that Demon Devil Lifespan could replace Lu Chen's own lifespan for martial-art deduction or repair deficits in his natural lifespan. Lu Chen initially held 78 years of the resource while his personal remaining lifespan was only one year. 2

Lu Chen soon used part of this reserve to restore himself: his personal lifespan rose to 23 years while his Demon Devil Lifespan fell from 78 to 56 years. The resource subsequently became the foundation of his growth, allowing him to improve techniques, derive breakthrough methods, repair life-threatening injuries, refine rare materials, and force short-term combat enhancements. 4

Mechanics

Acquisition

• Slaying demons and evil spirits — Demon Devil Lifespan is commonly obtained by killing demonic entities, such as the Vengeful Fox Evil Spirit, Stone-Skinned Soul-Peering Demon, and Nether River Angler. 2 40 45
• Processing demonic remains — As a Corpse Handler, Lu Chen can obtain small amounts from processing demon-related corpses; Carrion Crows yielded 21 days, while Cave Spiders yielded one month and five days. 21
• Plundering life essence and residual energy — The system can convert a defeated target's life essence, Killing Intent, deathly energy, or other remnants into the resource. Shadow Nine yielded 88 years after Lu Chen used the Spirit-Devouring Blood Refinement Art. 197
• Absorbing powerful origins — High-concentration demonic origin can produce exceptional returns. Killing the Holy Son incarnation granted 2,000 years. 141
• Destroying undead constructs — Residual deathly energy from controlled skeletal puppets can be converted into Demon Devil Lifespan. 301

Applications

• Martial-art deduction — It can be invested to supplement incomplete manuals, optimize techniques, or raise arts to higher mastery. One year partially deduced the fragmented Shadow Step, while 80 years completed the Demon Suppressing Saber Technique to the Perfection Realm. 21 35
• Breakthrough analysis — It can derive methods for major cultivation advances, though not necessarily grant a direct breakthrough. Lu Chen spent 800 years to obtain an optimal method for entering the Meridian Opening Realm. 89
• Healing and lifespan restoration — It can repair physical damage, soul exhaustion, life-foundation damage, and Lu Chen's natural lifespan deficit. 4 261 338
• Temporary combat enhancement — Lu Chen can burn it for brief improvements to movement, talismans, true qi, defensive power, or explosive strength. 200 219 502
• Technique and item refinement — It can refine Dragonbane Essence, extract Dragon Emperor Blood Essence, and support the deduction of new abilities such as the Godslayer Thunder Eye (Prototype). 247 325
• Strategic analysis — The system can expend it to calculate high-risk plans, including methods to break domains or exploit an enemy's weaknesses. 141 510

Constraints

• Finite reserve — Every application consumes the stored balance, and Lu Chen can exhaust it completely; he reached zero after using all 20 remaining years for an emergency burst. 502
• Major deductions are costly — Deriving a realm breakthrough method required 800 years, while analyzing and wielding the blade force behind Godslayer Slash required 1,000 years. 89 149
• Not all advancement is direct — For major realm leaps, the system may only provide a breakthrough method rather than immediately elevate Lu Chen's cultivation. 89
• High-level deductions carry risks — Deducing the second level of Godslayer Slash requires at least 300 years and places heavy demands on Lu Chen's soul; forced deduction risks backlash. 201
• Natural-lifespan conversion is not always available — Lu Chen later states that his personal lifespan is “locked,” preventing conversion from Demon Devil Lifespan for the time being. 201
• Reserve is strategically necessary — Lu Chen deliberately keeps some lifespan unspent so that he retains an emergency option against opponents beyond his normal strength. 35

Recorded Acquisitions and Balances

Notable Expenditures

Trivia

• Demon Devil Lifespan is measured in years, but low-level processing rewards can be recorded in days or months. 21
• The system distinguishes Demon Devil Lifespan from Lu Chen's natural lifespan and tracks both independently. 2 201
• Lu Chen considers the resource more immediately valuable than his own longevity because it can be exchanged for survival, healing, cultivation, and combat power. 325