IRON NESTField Notes

Guide

How Gas, Suppression, and Fire Shells Work

I need to understand how TEAR, PHGN, WP, INCN, and suppression or fire interactions work in practice.

Quick answer

Use TEAR to reveal and suppress rather than for immediate direct lethality. Multiple independent early-post-release community guides agree that PHGN becomes lethal against suppressed targets. WP has the same suppression-dependent lethal interaction plus fire-spread behavior, while INCN is the more direct incendiary and fire-spread option. These are practical early-1.0 observations, not version 1.0 (1618) code guarantees.

Practical interaction model corroboratedCorroborated scopeChecked Aug 13, 2026

Two independent post-release guides agree on the TEAR, PHGN, WP, and INCN interaction model, but the evidence is empirical and both detailed source pages now have degraded availability.

Version context: Independent early-1.0 community observations; no direct version 1.0 (1618) retest

Still uncertain

  • Exact internal fire-spread probabilities
  • Duration of gas, suppression, and fire states
  • Direct version 1.0 (1618) retest
  • Why both detailed Steam Community guide pages were removed

Evidence and verification context

  • Everything Ammo — version 1.0 (1577) test: Captured finite tests and the interaction model, including WP 12/25, INCN 13/25, and THRM 0/14. Its direct Steam Community page is currently marked removed.
  • Shell Effects Catalogue — independent post-release guide: Independently corroborates suppression-dependent lethality, approximate WP/INCN spread, and the THRM mismatch. Its direct Steam Community page is also currently marked removed.
  • Official Patch #4 notes: Do not list ammunition changes, but changelog silence is not treated as proof that early-1.0 behavior remained unchanged in version 1.0 (1618).

Steps

  1. Reveal and suppress with TEAR

    Use TEAR when the goal is to reveal and suppress targets rather than kill them immediately.

  2. Follow suppression with PHGN

    Multiple independent post-release guides agree that PHGN becomes lethal against targets that are already suppressed.

  3. Use WP for the combined interaction

    WP is reported to have the same suppression-dependent lethal interaction while also creating a chance of secondary fire spread.

  4. Use INCN as the direct fire option

    INCN is the more direct incendiary choice when fire and possible secondary spread are the main goal rather than a suppression interaction.

  5. Treat roughly 50% as an empirical estimate

    One documented version 1.0 (1577) test observed at least one spread event on 12 of 25 WP shots and 13 of 25 INCN shots. A separate post-release guide independently described both at roughly 50%; neither source establishes an exact internal probability.

Common mistakes

  • Treating the roughly 50% spread estimate as a guaranteed exact probability.
  • Planning around an invented duration for gas, suppression, or fire states.
  • Assuming Patch #4 changelog silence proves the early-1.0 behavior is unchanged in version 1.0 (1618).

THRM warning: Two independent early-post-release community guides report that THRM does not spread fire as its description appears to imply. One version 1.0 (1577) test recorded 0 spreads in 14 shots. This is an observed mismatch, not proof of the internal probability, a permanent confirmed bug, or unchanged behavior in version 1.0 (1618).

Why this works

Two independent early-post-release community guides report the same practical interaction model. One documents finite version 1.0 (1577) samples, while the other independently describes approximately 50% spread. Both direct guide pages are currently marked removed from Steam Community; the reason is not established. Their captured observations are therefore treated as corroborated but provenance-degraded empirical evidence, not as a direct 1.0 (1618) retest.