Prisoner in Deep Confinement
Prisoner in Deep Confinement is a relic set in Honkai: Star Rail with the following effects:
The 4-piece DEF-ignore-per-DoT-stack (up to 3) effect makes this a solid pick for DoT or hybrid Break/DoT characters wanting more direct-hit damage against afflicted enemies, though it's niche since it depends on maintaining DoTs.
Increases ATK by 12%.
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.
The block below gathers main-stat recommendations by character ROLE (not tied to one character) — most EN aggregator sites push this to a separate build page; here it sits right on the set page.
Flat HP — fixed, not selectable.
Flat ATK — fixed, not selectable.
Standard DPS: CRIT Rate or CRIT DMG. Support/healer roles: HP% or Outgoing Healing.
ATK% for most DPS; SPD if the team needs to act first or for support/CC roles.
General substat priority: CRIT Rate > CRIT DMG > ATK% > SPD — reorder for the specific character's role; this is only a safe default.
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.