Act boss whose central mechanic is a stun bar. V0.11.57863 (2026-08-01) rebalanced the stun bar so damage affects it more, parries affect it less, and it decays more slowly; this is the headline rebalance that changed which builds and Charm picks feel effective against her. Has suffered multiple visibility bugs: she occasionally floats above the ground (fixed in V0.9.57408 and V0.11.57863) and could remain invisible to players (V0.8.57278 added a temporary fix). Defeating the Banshee is the unlock trigger for Ruadh as of V0.8.57278, which is the only officially confirmed boss-to-hero unlock in the current build. Her specific Act number is wiki/community reference dated 2026-08-29.
Overview
Act boss whose central mechanic is a stun bar. V0.11.57863 (2026-08-01) rebalanced the stun bar so damage affects it more, parries affect it less, and it decays more slowly; this is the headline rebalance that changed which builds and Charm picks feel effective against her. Has suffered multiple visibility bugs: she occasionally floats above the ground (fixed in V0.9.57408 and V0.11.57863) and could remain invisible to players (V0.8.57278 added a temporary fix). Defeating the Banshee is the unlock trigger for Ruadh as of V0.8.57278, which is the only officially confirmed boss-to-hero unlock in the current build. Her specific Act number is wiki/community reference dated 2026-08-29.
Confirmed facts
| Confirmed facts | Iseult the Banshee |
|---|---|
| Boss | boss |
| Game version scope | Tears of Metal Early Access (Steam AppID 1913120), V0.11.57874.1 hotfix state on 2026-08-09 (mechanics from V0.8.57278 / V0.9.57408 / V0.10.57598 / V0.11.57863 patches). |
| Remake status | Original Early Access build (2026-07-22 launch); not a remake or remaster. |
| Act or encounter context | Act boss; per V0.8.57278 the encounter gates the unlock of Ruadh (Stonecrusher) for the rest of the campaign. |
| Encounter summary | Stun-bar focused boss fight where player damage chips the bar faster than parries, while the bar decays more slowly than at launch. She has had recurring visual glitches (floating above the ground, sticking invisible) that the team has repeatedly patched. |
| Notable attacks or cues | Block-breaking attacks (these attacks can now be parried as of V0.8.57278). Occasionally jumps away and never returns (V0.9.57408 bug-fix entry); can float above the ground (fixed V0.9.57408 and again V0.11.57863). |
| Recommended preparation | Stack raw damage sources over parry-heavy builds (V0.11.57863 made parries less effective against the stun bar and slowed its decay). V0.8.57278 confirmed that Block-Breaking attacks from bosses are parryable, so parries still have value as defensive tools even though they feed the stun bar less. |
| Is a launch boss | Yes |
| Source tier | official_store_and_patch_notes |