Most dungeon crawlers settle for “everyone picks an action, then everyone acts.” Iron Abyss’s developer OTR HVN looked at that model during early builds of the game and, by their own account, ripped it out. What replaced it is a combat system that owes a lot more to Final Fantasy X’s Conditional Turn-Based system than to anything in the standard dungeon-crawler playbook — and it changes how you actually think about fights in Iron Abyss.

Turn Order Is a Resource, Not a Given

In the original build, all three of your pilots and every enemy picked and resolved actions in the same beat, every round, like clockwork. The v0.1.2 combat overhaul threw that out in favor of individual DEX-based counters for every pilot and enemy. Instead of a rigid round structure, turn order gets determined sequentially based on those counters — meaning a fast pilot can act multiple times before a slow enemy gets a single turn in.

That single change turns “what do I do this turn” into “what do I do with my position in the queue,” which is a much more interesting question.

Actions Cost Tempo, Not Just Resources

Here’s the mechanic that actually makes the DEX system matter: every action carries a tempo weight. Light actions like DEFEND and basic ATTACK are cheap and get you back in the queue fast. Heavier plays — HEAVY STRIKE, HACK — cost more tempo, pushing your next turn further out.

That means the real decision in Iron Abyss combat isn’t “what’s my best move,” it’s “what’s my best move for what I can afford to give up in turn order.” Do you throw the big hit and accept that the enemy gets two turns before you act again? Or do you stay light and fast and out-tempo them instead?

To help you actually track this, the interface shows a turn-order display previewing the next six actors, complete with crew portraits and enemy designations, plus an “ACTION RESOLVING” overlay so you always know whether you’re watching the system play out a queued action or waiting on your own input.

Targeting Got Simpler So Positioning Got Harder

An earlier version of the game had a front/back row targeting split — a very standard JRPG convention. OTR HVN removed it. Every pilot is now a valid target, all the time. That sounds like a simplification, and mechanically it is, but it actually raises the stakes: there’s no safe row to hide your MEDIC in anymore. Positioning stops being about literal battlefield geometry and becomes entirely about tempo management and target prioritization.

Sanity Isn’t Flavor Text — It’s a Resource You’ll Fight Over

Layered on top of the tempo system is Iron Abyss’s sanity mechanic, and it’s not cosmetic. Pilots accumulate psychological damage from losses, near-death moments, and prolonged exposure to whatever’s down in the abyss. Let it run too high and you’re not managing HP bars anymore — you’re managing a squad on the verge of a breakdown.

The game gives you tools to manage it both ways. On the recovery side, there’s GREY MATTER CLEANSE, a consumable that strips 12 points of insanity off a pilot for 30 SCRAP. On the aggression side, there’s BREAKDOWN — a mechanic that lets you deliberately spend a crew member’s accumulated insanity to unleash a powerful but genuinely risky move. It’s a rare example of a “madness” stat in an RPG that’s actually a build-around resource instead of a punishment you’re just trying to avoid.

Contacts, Not Random Encounters

One more change worth flagging for anyone allergic to random-encounter fatigue: Iron Abyss doesn’t do blind RNG pulls into combat. Enemies render as visible, positioned contacts on the map that only engage once you close within five tiles of them. You can see the fight coming, and — if your tempo math says you should — you can route around it entirely.

The Net Result

What you end up with is a combat system where the interesting decisions happen before the fight even starts — how you route around contacts, which pilot you’re willing to push toward a BREAKDOWN, whether a HEAVY STRIKE is worth ceding two enemy turns for. It’s a tactics game where tempo and sanity do the work that formation and elemental weaknesses usually do in the genre.

The demo is free and live now if you want to feel this system out yourself before Iron Abyss’s full release on August 11, 2026.

Play it here: otrhvn.itch.io/iron-abyss