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Opero 77 | Arknights: Endfield Weapon Guide & Leveling Stats | Endfield Builds

Opero 77 Guide and Database - Arknights: Endfield

Opero_77
Opero 77 Polearm - Arknights Endfield Weapon

Opero 77

4 Star Rarity
TypePolearm
SourceExploring and Gathering
Release2025

"A weapon equipped by Endfield operators to significantly boost their combat capabilities. One of the standard-issue operator weapons manufactured by Endfield Industries. This weapon is personally designed by senior Endfield Arsenal Engineer Opero. It can be wielded effectively by even newly minted Endfield operators, thanks to its ergonomic designs."

Comprehensive guide for the Opero 77 Polearm in Arknights: Endfield. Learn where to get Opero 77 (Exploring and Gathering) and its utility for your team.

Skill_Analysis

// Subsystem_Link: POLEARM

Polearm mechanics

Weapon Skill(s)

Ability
Neural_Drive: Active // Rank_Scaling_Available
Weapon Skill(s) scaling per rank for Polearm

Weapon_Archive

Ref_ID: — — — — — // Intelligence_Entry

Access_Level

Restricted

...therefore, I must re-emphasize the necessity of making field practicality the prime design objective of any weapon — and that means the fuller grooves on 77 are obsolete and redundant features that serve no purpose! You must understand that our enemies neither bleed nor feel pain. Stop adopting design elements from those Rhodes Island engineering drawings. Aesthetics?! I am taking that very personally, sir. The greatest virtue of any weapon lies not in its appearance! If I wanted to make things look nice, I would be working at Mieszko Industries and not at this blasted place! — Meeting minutes of the third design conference for Opero 79

Endfield_Database_Service // Security_Encrypted

More_Armaments_In_Database

Armory_Registry_Navigation

Asset_Class
Registered_Units
Polearm
Qty: 09
LevelMain Attribute Boost [S]Assault: Armament PrepEfficiency
R-01Main attribute +8ATK +12.Efficiency: 11.11111111111111%
R-02Main attribute +15ATK +14.4.Efficiency: 22.22222222222222%
R-03Main attribute +21ATK +16.8.Efficiency: 33.33333333333333%
R-04Main attribute +28ATK +19.2.Efficiency: 44.44444444444444%
R-05Main attribute +35ATK +21.6.Efficiency: 55.55555555555556%
R-06Main attribute +42ATK +24.Efficiency: 66.66666666666666%
R-07Main attribute +48ATK +26.4.Efficiency: 77.77777777777779%
R-08Main attribute +55ATK +28.8.Efficiency: 88.88888888888889%
R-09Main attribute +65ATK +33.6.Efficiency: 100%

Data_Verification: Protocol_Endfield_312

Weapon Passive and Active Skills Scaling

Analyze how Polearm skills improve with each rank. Our database provides exact values for combat bonuses and secondary effects for all Arknights: Endfield weapons.

Enhancement_Protocols

// Ascension_Requirements // Limit_Break

01
Elite I Ascension Requirement

Elite I

Limit: LVL 20

Required_Components // Upgrade_Materials
  • Cast Die
    x5
    Cast Die
  • Kalkonyx
    x3
    Kalkonyx
02
Elite II Ascension Requirement

Elite II

Limit: LVL 40

Required_Components // Upgrade_Materials
  • Cast Die
    x18
    Cast Die
03
Elite III Ascension Requirement

Elite III

Limit: LVL 60

Required_Components // Upgrade_Materials
  • Heavy Cast Die
    x27
    Heavy Cast Die
04
Elite IV Ascension Requirement

Elite IV

Limit: LVL 80

Required_Components // Upgrade_Materials
  • Heavy Cast Die
    x50
    Heavy Cast Die

Arknights: Endfield weapon upgrade guide. Elite promotion materials list, level cap requirements and limit break components for all rarity tiers.

Protocols_Verified // Archive_09

Opero 77 Base and Max Stats

Weapon Scaling & Combat Analysis

// Attack Power Scaling // Level_Progression

Base_Atk_Value
29
Peak_Atk_Scaling
309
  • Weapon Level LV.01
    29ATK
    Stat Efficiency9.4%
  • Weapon Level LV.20
    83ATK
    Stat Efficiency26.9%
  • Weapon Level LV.40
    140ATK
    Stat Efficiency45.3%
  • Weapon Level LV.60
    197ATK
    Stat Efficiency63.8%
  • Weapon Level LV.80
    254ATK
    Stat Efficiency82.2%
  • Weapon Level LV.99
    309ATK
    Stat Efficiency100.0%

Data_Source: Endfield Character Database

Opero 77 Potential Upgrades

Weapon Potentials

// Tactical_Upgrade_Sequence // Asset_Calibration

  • 5
    Weapon Potential Rank 5
    Rank 05
Cohesive Traction
JET
Mountain Bearer
Valiant
Chimeric Justice
OBJ Razorhorn
Aggeloslayer
Opero 77
Pathfinder's Beacon
Great Sword
Qty: 12
Exemplar
Former Finery
Khravengger
Sundered Prince
Thunderberge
Ancient Canal
Finishing Call
OBJ Heavy Burden
Seeker of Dark Lung
Industry 0.1
Quencher
Darhoff 7
Handcannon
Qty: 10
Artzy Tyrannical
Clannibal
Navigator
Wedge
OBJ Velocitous
Opus: The Living
Rational Farewell
Howling Guard
Long Road
Peco 5
Sword
Qty: 17
Eminent Repute
Forgeborn Scathe
Grand Vision
Never Rest
Rapid Ascent
Thermite Cutter
Umbral Torch
White Night Nova
Aspirant
Finchaser 3.0
Fortmaker
OBJ Edge of Lightness
Sundering Steel
Twelve Questions
Contingent Measure
Wave Tide
Tarr 11
Arts Unit
Qty: 14
Chivalric Virtues
Delivery Guaranteed
Detonation Unit
Dreams of the Starry Beach
Oblivion
Opus: Etch Figure
Freedom to Proselytize
Monaihe
OBJ Arts Identifier
Stanza of Memorials
Wild Wanderer
Fluorescent Roc
Hypernova Auto
Jiminy 12
Registry_v4.0 // Database_Sync_Active

Arknights: Endfield Weapons Database

Complete armory directory including Swords, Great Swords, Polearms, Handcannons, and Arts Units.

Auronyx
x5
Auronyx
Umbronyx
x5
Umbronyx
Igneosite
x8
Igneosite
  • Metadiastima Photoemission Tube
    x36
    Metadiastima Photoemission Tube
  • Potential 5

    Skill Assault: Armament Prep improved.

    Arknights Endfield weapon potential enhancement bonuses and stats.

    CalibrationActive_Mod
    Endfield Armory Archive // Calibration_Data