Prisoner in Deep Confinement

2-Pc

Increases ATK by 12%.

4-Pc

For every DoT the enemy target is afflicted with, the wearer will ignore 6% of its DEF when dealing DMG to it. This effect is valid for a max of 3 DoTs.

Where to farm

Cavern of Corrosion: Path of Darkness

Zone: The Xianzhou Luofu · Fyxestroll Garden

Trivia — Verified From Game Data

2-Piece (verified from data-mine)

ATK +12%

Characters Who Use This Set

Full-set fit

Kafka

Jiaoqiu

Black Swan

Robin

Hysilens

Serval

Sampo

Luka

Guinaifen

2-piece or 4-piece?

Based on current data, 2 pieces are enough — no character is recorded as needing the full 4-piece bonus of this set, so you can mix it with another set on the remaining slots.

Priority substats

Derived from the recommended substats of characters currently using this set (Kafka, Black Swan, Luka, Guinaifen, Hysilens, Sampo):

SPD > ATK% > EHR% (tới ~75%)

Relic stats

Main stats — value at max level (5★)

Main stats are not random: at max level you always get exactly this number.

HeadFixed — nothing to farm for

HP705

HandsFixed — nothing to farm for

ATK352

Body

HP43.2%
ATK43.2%
DEF54%
CRIT Rate32.4%
CRIT DMG64.8%
Outgoing Healing Boost34.5%
Effect Hit Rate43.2%

Feet

HP43.2%
ATK43.2%
DEF54%
SPD25

Sub-stats — value of one roll (5★)

Every +3 levels grants one roll, landing randomly on one of the three values below. These are the true values added to your stats; the in-game panel shows them rounded down.

Stat	Low	Mid	High
HP	33.9	38.1	42.3
ATK	16.9	19.1	21.2
DEF	16.9	19.1	21.2
HP	3.5%	3.9%	4.3%
ATK	3.5%	3.9%	4.3%
DEF	4.3%	4.9%	5.4%
SPD	2	2.3	2.6
CRIT Rate	2.6%	2.9%	3.2%
CRIT DMG	5.2%	5.8%	6.5%
Effect Hit Rate	3.5%	3.9%	4.3%
Effect RES	3.5%	3.9%	4.3%
Break Effect	5.2%	5.8%	6.5%

What main stat to run, by role

Getting the main stat on the right slot is the baseline — substats aimed the right direction decide your real power. The table below is a default framework by role, useful for a quick lookup before you know a specific character's kit.

	Body	Feet	Planar Sphere	Link Rope	Sub-stat priority
Main DPS	CRIT Rate or CRIT DMG	ATK% or SPD	the character's own Elemental DMG Boost	ATK% (or Break Effect for a break-focused kit)	CRIT comes first — aim for roughly a 1:2 ratio of CRIT Rate to CRIT DMG — then ATK%, then SPD.
Healer	HP% or Outgoing Healing Boost	HP%	HP%	Energy Regeneration Rate or HP%	HP% first, then SPD — healing output scales off the target's Max HP.
Tank / Shielder	DEF% or Effect Hit Rate	DEF% or SPD	DEF%	DEF% or Energy Regeneration Rate	DEF% first, then Effect Hit Rate, then SPD.
Support	No safe default — depends on the character's kit, check that character's page	SPD, almost always correct	No safe default — depends on the character's kit, check that character's page	Energy Regeneration Rate	SPD first; add Effect Hit Rate if the character applies debuffs.

This is a default framework, not a hard rule. Some characters break from it because of their own kit — for example a support that needs CRIT DMG or Break Effect instead of Energy Regeneration Rate. Always check that character's page before locking in a set.

Basic rules you need before picking Relics

Head always rolls flat HP, Hands always roll flat ATK — no need to check the main stat on these two, just look at the substats.
Only Feet can roll SPD as a main stat; only the Link Rope can roll Energy Regeneration Rate as a main stat.
A substat never duplicates that piece's own main stat, and the four substats never duplicate each other.
Each piece caps at 4 substats. Every +3 upgrade grants one roll — either unlocking a new substat line or boosting an existing one at random.
Enhancement cap by rarity: 2-star +6, 3-star +9, 4-star +12, 5-star +15. Starting substat count: 3-star 1–2 lines, 4-star 2–3 lines, 5-star 3–4 lines.
The main stat is NOT random — at the level cap it's always the exact same fixed number. Only substats roll randomly.
Quick filter trick: enhance to +9 and you already see enough substat quality to decide keep-or-salvage — don't burn all your resources to +15 before judging.

Should you keep or salvage this piece?

Wrong main stat for the slot (e.g. an HP% Sphere on a Lightning DPS) → salvage it right away, don't get attached.
Right main stat but the 4 substats don't have even one line of CRIT Rate / CRIT DMG / SPD (for a DPS role) → low value, salvage first.
Right main stat plus at least 2 substats you actually need from the start → enhance to +9 and reassess — this piece is worth investing in.

Where can you get Relics?

Cavern of Corrosion — the main source of the 4 Cavern Relic pieces, with 6 difficulty tiers tied to your account's Equilibrium Level; the higher your Equilibrium Level, the thicker the 5-star drop rate.
Simulated Universe — source of the 2 Planar Ornament pieces, only unlocked from World 3 onward.
Divergent Universe — a second source for Planar Ornaments, separate from the Simulated Universe.
Operation Briefing — clearing these objectives also pays out Relics and related materials.
In-game shops — some vendors sell full 4-piece sets directly for in-game currency.
Treasure chests scattered across the main story maps.
Story quest rewards, plus milestone rewards for leveling up your Trailblaze Level.

Relics unlock during the Belobog story arc. To target the exact set and slot you need instead of farming blind, use the Omni-Synthesizer: it runs on Relic Remains, which you get by salvaging Relics you don't use. The machine unlocks from Equilibrium Level 3 onward.

Every piece & its lore

Official in-game name, description and story of each piece — tap to expand

Prisoner's Sealed MuzzleHead

A muzzle designed to tightly encage the captive's beastly visage, guarding against the feral fangs that yearn to inflict harm.

Smell was the sense that constructed the borisin Warhead's sense of the world. Rain, dust, campfire, blood, medicine... From the deepest part of the battlefield, they came shaking and wafting, with a torrent of odors that flooded every inch of his neurons.

All he could smell now is the heavy sturdiness of the torture devices, and the cowering fear of the jurors filling the air.

He knows that these weak-fleshed judges are afraid of the sharpness of his fangs — He had stood on the precipice of a steep cliff, bathed in the moonlight of madness, and felt the instinctive impulse in his veins. He had followed the labyrinth of smells, penetrating into the enemy's camp in the darkness of a lightless night, and crushed the skulls of his prey one by one... The borisin Warhead admires the concept of polished fangs, regarding them as blades and spears, symbols of the power and confidence to tear apart anything.

"The borisin Brood Lord gnashed and gnawed on flesh, devouring the blood of innocents. He is sentenced to a lifetime in a cage with his face covered in a closed-mouth muzzle, convicted of the Ten Unpardonable Sins."

The Warhead contemptuously looks around. The swordmaster who engulfed everything like an icy sea of fury is not there... He has no interest in this tedious sentence.

Prisoner's Leadstone ShacklesHands

Heavy shackles that tightly bind the evildoer's hands with steel needles pinning into the wrists, preventing the vicious claws from doing harm again.

As the clouds parted, the moon's shadowy light poured over the Warhead's scarred body. The huge claw that was slashed off by the silver-haired swordsmaster was left aside, and the desperate Warhead's blood vessels pulsated furiously. Accompanied by a long, painful howl, he grew his sharp claw once more.

Catalyzed by Moon Rage, the Warhead barely caught up with the moonlight-like sword strikes. He prayed silently to the power of Abundance, determined to finish the final fight as a trapped beast.

He had already forgotten how many times the borisin army had broken through, only remembering the countless times his soldiers had used their claws to tear open the gaps in their advance, only for it to tightly close again. The exhausted borisin relied on their nigh indestructible regeneration, struggling to tear down all obstacles before them — The Warhead's blood soaked his claws and he sank into a trance, only to suddenly realize that he had nowhere to run, and there are no more soldiers following him.

"Borisin Brood Lord, you have taken countless lives by your own hand. Your wrists shall be bound in lead and stone and put under strict control."

The Warhead finally collapsed, powerless, in front of the swordsmaster. For the first time, he felt that exhausting near-death experience. "What an incomparable blade," he couldn't help but think, "What an incomparable thrill!"

Prisoner's Repressive StraitjacketBody

A prisoner's garment that restrains dangerous criminals. Its reversed-joint design confines the prisoner's body.

The borisin are warriors by nature. Their bone structure is broad and lean, with powerful jaws and neck muscles. They have well-developed canine teeth, beast-like ears on top of their heads, and sharp claws on their hands and feet. The borisin worship the concept of a strong body, seeing strong physique as a blessing from the gods.

The Warhead is both the spiritual leader and the strongest warrior of the tribe, commanding its tide-like army, and dominating life and death on the battlefield.

The fearsome beast ships setting off covered the very sky, and he looked down at the restless warriors on the battlefield — The borisin Warhead felt the call of Moon Rage. Sharp bone spikes pierced through his body, and his pitch-black blood disappeared in the wind like mist. He stretched out his arms like a martyr — the borisin's Lupitoxin, the fear-inducing pheromone, dispersed along with the blood mist and stimulated the borisin warriors' senses, making them seem possessed by the power of gods and demons.

"O' Brood Lord, grant us muscles of iron and bones of steel. O' Brood Lord, grant us the power of the gods."

He recalled the days when flesh and blood were not restrained. Children of the borisin, who carry Moon Rage in them, had broken through the limitations of flesh and blood. Their bodies erupted and deformed, yet no longer able to feel pain or fear. Guiding them was once a privilege and responsibility reserved only for the strong.

Prisoner's Restrictive FettersFeet

Metal shackles that bind the feet of the beasts, imprisoning evils and preventing them from escaping and wrecking havoc.

The borisin roam the galaxy, despising the settled civilizations. They took away peace and tranquility and brought all-consuming war with them. Their harsh beliefs in survival compel them to fight incessantly, ever-devoting themselves to a life of bloodshed.

They have their own beliefs and ways — wherever the borisin set foot, it becomes their territory and nation.

The borisin Warhead takes pride from igniting one flame of war after another, crushing the dignity of protectors, drinking the tears of the displaced, and trampling on the trust of close ones. He allowed thorns to grow wild and fertile land to be destroyed, forced people into slavery and enjoyed an extravagant life... In order to surpass the past leaders, the new Warhead had to cast aside peace and lead his soldiers on an expedition to the outside world in order to make a name for himself and affirm his position in the tribe.

"Borisin Brood Lord, with you come war and a scourge upon all worlds. Your sentence is to be eternally detained and imprisoned, never to be reborn."

The Warhead is puzzled by the sentence. He looks around, confused at the trials of the weak. Those so-called crimes are nothing more than the laws of survival.

FAQ

How many pieces of Prisoner in Deep Confinement do I need for the bonus?

Prisoner in Deep Confinement has separate 2-piece and 4-piece effects — see the effect table above to compare.

Which characters should use Prisoner in Deep Confinement?

Characters that fit Prisoner in Deep Confinement: Kafka, Jiaoqiu, Black Swan, Robin, Hysilens.

Is Prisoner in Deep Confinement a Relic Set or a Planar Ornament?

Prisoner in Deep Confinement is a Relic Set (cavern) — 4 pieces (Head/Hands/Body/Feet), with separate 2-piece and 4-piece bonuses.

Where do I farm Prisoner in Deep Confinement?

Prisoner in Deep Confinement farming location: Cavern of Corrosion: Path of Darkness.

How to read this relic set page

Cavern Relics have 4 pieces: Head and Hand always carry fixed flat stats (HP and ATK), so only Body and Feet have a random main-stat you actually choose. The 2-piece effect unlocks with 2 out of 4 pieces from the same set; the 4-piece effect is stronger but needs all 4 and usually has its own trigger condition — read the exact text above before committing. Planar Ornaments only have 2 pieces (Planar Sphere + Link Rope) and only ever have one 2-piece effect, there is no 4-piece version.

The two types also differ in where you get them: Cavern Relics drop from the Cavern of Corrosion and cost Trailblaze Power per run; Planar Ornaments come from the Simulated Universe or Divergent Universe, which do NOT cost Trailblaze Power — you trade for them with items or completion rewards instead. A full loadout usually combines one 4-piece Cavern set (or two different Cavern sets at 2 pieces each) with one 2-piece Planar set — go 4-piece when that set gives a large, reliable damage buff, and mix 2+2 when you need to stack several smaller stats (e.g. ATK% from one set plus Elemental DMG% from another).

The "who should use this" list is pulled from cross-sourced build consensus and updates automatically as the meta shifts, it is not hand-picked. See the full set table on the Relics page, or check terms in the HSR Glossary.

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