Umbral Monument: Series Schedule, Mechanics & Teams — Arknights: Endfield

Umbral Monument is Endfield's permanent endgame mode where the same enemy roster is re-packaged into SERIES, each stage carrying its own unique buff/debuff twist. This page collects the full schedule of all 6 series released so far, breaks down the 4 stages of the newest series Howlers of the Crag (released Aug 6, 2026), and compiles a table found nowhere else: exactly what each stage restricts, in one place.

Umbral Monument unlocks once you reach Authority Level 30 and clear the main story stage Chapter I Process II: Paving the Way. It isn't a single fight — it's a SERIES system, each series made of 3 or 6 stages, and each stage is its own encounter with a buff/debuff mechanic that only applies there.

Every stage has 2 difficulties: Standard (unlocked first) and Agony (unlocks after clearing Standard). In Agony, enemies are level 90 and consumable support items are banned. Each attempt has a 10-minute time limit — clear all enemies in the stage to win; team size is fixed at 4 operators. Clearing Standard grants an engraved medal; clearing Agony grants a higher-tier trimmed medal.

Monumental Etching is a limited-time event that accompanies each new Umbral Monument series, usually with its own name and cosmetic rewards tied to that series. Released so far: Old Wounds (series 1) · Scorch Mark (series 2) · Corrupting Surge (series 3) · Dirge of Grief (series 4) · Beastly Howl (series 6, currently running).

Umbral Monument pays out per stage and per difficulty (Standard/Agony), usually operator upgrade materials and currency. Exact reward quantities cannot yet be cross-checked against gamevika's own official data files — treat any specific number you see elsewhere as community-reported, not an official developer figure.

Numbers compiled by the community — the developer has not published an official reward table.

Because each stage carries a different penalty/bonus mechanic, the best team changes stage by stage rather than staying fixed. Below is a team direction gamevika worked out ourselves from the operator and build data already in our own system — not a lineup copied from any outside source.

Heat

Laevatain Akekuri Camille Ember

Combustion direction: Laevatain is the main Combustion carry, Akekuri keeps the team's SP flowing, Camille builds Heat via Arts, Ember tanks hits — all four are Heat, so King of the Crag's permanent Combustion only stacks in the team's favor instead of getting diluted by other elements.

Electric

Zhuang Fangyi Perlica Arclight Antal

Electric direction: Zhuang Fangyi is the off-field Electric hypercarry, Perlica procs reactions automatically, Arclight layers extra Electric with her sword kit, Antal provides the Arts backbone — King of the Crag's permanent Electrification amplifies exactly the combo this group was already built around.

Cryo

Estella Alesh Tangtang Snowshine

Cryo → Solidification direction: Estella applies Cryo Infliction, then Alesh forcibly converts it into Solidification (exactly what her own build data describes), Tangtang stacks Arts Susceptibility through Cryo, Snowshine covers defense and healing — King of the Crag's permanent Solidification makes this loop grow stronger over time instead of fading.

gamevika's own team suggestion (not an official loadout)

The table below gathers every restriction across the newest series' 4 stages in one place — something no community source has compiled. Read it before you queue up so you know exactly what each stage bans, without burning an attempt on a rule you didn't see coming.

King of the Crag is series 6's hardest stage: every elemental effect becomes permanent and stronger. gamevika compiled 3 different team directions, each built around ONE dominant element (based on our own operator build data) instead of spreading across many — exactly the warning flagged in the restriction table above.