UnderRail is a single-character, turn-based CRPG, and that one fact governs how its character system works. There is no party to cover a weakness, no second hero to fall back on, and no respec to undo a bad decision. Your build — the combination of stats, skills, and feats you assemble at creation and at each level-up — is permanent. That makes character creation one of the most consequential screens in the game, and it is worth understanding the whole system before you spend a single point.
This guide is a reference you can come back to: the seven stats, every skill and the ability that governs it, the exact synergy bonuses, feats and specializations, the two XP systems, and crafting.
Where to spend your points — ranked
UnderRail gives you 40 skill points per level and no respec. That combination is why build advice for this game is worth reading before you click, not after. Here is the priority order, and the reasoning behind each place on it.
| Rank | Where the points go | Why it ranks here |
|---|---|---|
| 1 | **One damage skill, kept near its cap** | Everything else in the build is support. A character who is second-best at two weapon types loses to one who is best at one, because enemy resistances scale against your actual number, not your breadth. |
| 2 | **One crafting skill matched to that weapon** | Crafted gear reliably outclasses anything you buy or loot, so this is not optional flavour. Mechanics and Electronics for guns and crossbows, Tailoring for armour, Chemistry and Biology for bolts, grenades and consumables. Raise it *alongside* your damage skill, not after — otherwise the high-quality components you find are wasted. |
| 3 | **The synergy partner of what you already bought** | Free value if you line it up: Hacking is boosted by Electronics, Lockpicking by Mechanics and Traps, Biology by Chemistry at 15%. If your build already needs one half, the other half is discounted. |
| 4 | **Persuasion and Mercantile — as a pair or not at all** | These feed each other at **20% each way**, the strongest synergy in the game. Buying one and not the other is the single most common way to waste points on this list. |
| 5 | **Everything else: leave it at zero** | With 40 points a level and no way back, a skill you "might use" is a skill you paid for twice — once in points, once in the damage skill you did not cap. |
The one trap that is not about skills: do not mine an ability down to 3 for extra points. Each point above 4 gives +8.5% to the skills it governs, but each point below 4 costs you -10%. Dumping is a worse trade than raising, so a stat you have no use for should sit at 4, not 3.
Everything below is the machinery behind that order — the seven abilities and what each governs, every skill, the full synergy table, how feat prerequisites actually check, Expedition specializations, and the Classic versus Oddity XP choice.
Why there is no respec
This is the question new players ask first, so it is worth answering plainly: UnderRail has no respec. Nothing you choose can be reallocated later.
Three separate rules make that true, and each one is a little stricter than players expect:
- Ability points arrive only once every 4 levels, and none at all at Veteran levels. Across a whole run your stats drift slightly upward — they never transform.
- Skill points are spent per level and stay spent. A skill also cannot exceed 10 plus 5 per current level, so you cannot neglect something for ten levels and then rush it.
- Feat points must be spent the moment you level up. They cannot be saved for a later choice, and they cannot be reallocated afterwards.
A character built around Perception for guns will never become a Will-based psychic partway through. This is design, not oversight. UnderRail expects you to commit and then earn your power through knowledge, gear, and tactics rather than constant rebuilding.
The practical takeaway is simple. Decide your damage style first, then choose stats, skills, and feats that all point the same direction. A coherent build beats a flexible one here, every time.
The seven stats
Every ability starts at 5 and can be set anywhere from 3 to 10 at creation, drawn from a shared pool — so raising one means lowering another. 4 is the neutral value. Each point above 4 grants +8.5% to the skills that ability governs, and each point below 4 imposes -10%.
That asymmetry matters more than it looks. Dumping a stat to 3 costs you more per point than raising it to 5 gains you, so a stat you have no use for should usually sit at 4 rather than being mined for points.
| Stat | What it governs | Who needs it |
|---|---|---|
| Strength | Melee damage, carry capacity, enables heavy weapons such as sniper rifles and sledgehammers | Sledgehammer and heavy-weapon melee builds |
| Dexterity | Lockpicking, thievery, throwing, initiative, melee crit; cuts AP cost for unarmed and light weapons | Knife, pistol, SMG, and throwing builds |
| Agility | Dodge, evasion, initiative, movement points, stealth | Light, mobile, and stealth characters |
| Constitution | Health and stamina, resistance to poison and disease | Tanky frontline and heavily armored builds |
| Perception | Ranged weapon effectiveness, detecting hidden objects, passages and creatures | Almost every gun and crossbow build |
| Will | Psi discipline potency and psi point regeneration | Psi builds of every school |
| Intelligence | Science skill learning, psi point regeneration, and the number of psi abilities usable in combat | Crafters, hackers, and psychics |
Notice how many builds lean on two stats at once. A crossbow user wants Perception and Dexterity; a psychic wants Will and Intelligence. That is exactly why you cannot raise everything — every stat you push toward 10 is one you are starving elsewhere.
Every skill and the ability that governs it
There are 23 skills, and you get 120 skill points at creation and 40 per level. Each skill caps at 10 plus 5 per current level.
The single most useful thing to know is which ability governs which skill, because a mismatch between your stat spread and your skill plan quietly taxes everything you do.
| Group | Skill | Base ability | What it does |
|---|---|---|---|
| Offense | Guns | Perception | Precision and damage with pistols, SMGs, rifles and energy weapons |
| Offense | Throwing | Dexterity | Precision with throwing weapons and utilities, including grenades |
| Offense | Crossbows | Perception | Precision and damage with crossbows |
| Offense | Melee | Strength or Dexterity, whichever is higher | Damage with melee and unarmed attacks; helps overcome dodge |
| Defense | Dodge | Agility | Chance to avoid melee attacks |
| Defense | Evasion | Agility | Chance to avoid ranged attacks and reduced area damage |
| Subterfuge | Stealth | Agility | Avoiding detection in stealth mode, and stealth combat |
| Subterfuge | Hacking | Intelligence | Computers, electronic locks, cameras and turrets |
| Subterfuge | Lockpicking | Dexterity | Mechanical locks and dismantling mechanical barriers |
| Subterfuge | Pickpocketing | Dexterity | Stealing items directly from other characters |
| Subterfuge | Traps | Dexterity | Planting and disarming traps, and spotting them |
| Technology | Mechanics | Intelligence | Crafting weapons, armor and traps |
| Technology | Electronics | Intelligence | Crafting electronic utilities and energy weapons |
| Technology | Chemistry | Intelligence | Crafting explosives and chemical weapons |
| Technology | Biology | Intelligence | Crafting medicine and extracting substances from organisms |
| Technology | Tailoring | Intelligence | Crafting lightweight armor from leather and cloth |
| Psi | Thought Control | Will | Influencing minds through suggestion and domination |
| Psi | Psychokinesis | Will | Mechanical force, electricity and EM field manipulation |
| Psi | Metathermics | Will | Controlling temperature and harnessing thermal energy |
| Psi | Temporal Manipulation | Will | Local manipulation of time perception |
| Social | Persuasion | Will | Convincing others through non-violent dialogue |
| Social | Intimidation | Will | Making someone act out of fear |
| Social | Mercantile | Intelligence | Better prices and better quest rewards |
Two things jump out of that table. Intelligence carries seven skills — all five crafting skills plus Hacking and Mercantile — which is why almost every serious build finds room for it. And Will carries six — all four psi schools plus both mind-affecting social skills — so a psychic gets the persuasion side of the game nearly for free.
The most common way a new build fails is spreading skill points too thin. Forty points per level feels generous, but keeping a skill near its rising cap costs a large share of that budget every single level. Pick one damage skill, two or three support skills, and your crafting skills — then commit. A specialist clears fights a generalist simply cannot.
Skill synergies
Some skills passively raise others. This is free value if your build happens to line up, and it is worth knowing before you allocate rather than after.
| Skill | Boosted by | Amount |
|---|---|---|
| Dodge | Evasion | 10% |
| Evasion | Dodge | 10% |
| Hacking | Electronics | 10% |
| Lockpicking | Mechanics, Traps | 10% each |
| Traps | Lockpicking, Mechanics | 10% each |
| Chemistry | Biology | 10% |
| Biology | Chemistry | 15% |
| Each psi school | The other three psi schools | 10% each |
| Persuasion | Mercantile | 20% |
| Mercantile | Persuasion | 20% |
| Intimidation | Persuasion | 10% |
The social block is the strongest of these — Persuasion and Mercantile feed each other at 20%, so investing in one meaningfully carries the other. The psi block is the widest: any psychic running two or more schools is boosting all of them at once, which is part of why hybrid psi builds hold together so well.
Synergy cannot exceed the cap. A boost raises your effective skill only up to the maximum base value for your current level. You cannot use synergy to reach a number you were not allowed to buy.
Feats, and why prerequisites catch people out
You begin with two feat points and gain one at every even level. Feats are the active and passive perks that define how your build actually fights — special attacks, defensive tricks, crafting boosts, psi enablers.
Two rules do most of the damage to unprepared builds:
- Feat points must be spent immediately. You cannot bank one while you wait for a prerequisite to come online.
- Prerequisites check unmodified scores. They read your base ability and base skill values, not the effective numbers that include synergy bonuses or gear. A skill that displays as high enough may still fail to qualify you.
That second rule is the one that surprises people. If a feat you want at level 12 needs a skill threshold, you have to buy that threshold with real skill points — a synergy bonus that makes the number look right will not open the gate.
Treat your feat path as a roadmap you sketch early, not a series of impulse buys. Knowing which feats anchor your build tells you where your stats and skills must be when those feats unlock.
Specialization points in Expedition
If you have the Expedition expansion, the character system gains another layer. After level 15 you earn 1 specialization point per level, up to 15 by the level 30 cap. They do not grant new feats — they improve feats you already have, usually along one specific dimension.
The Specialist feat grants an additional specialization point per level, which allows up to 30 in total if you take it at level 16.
The lesson echoes the rest of the system. Because specializations reinforce existing feats, they reward a focused build that already knows what it does well. A scattered character has nothing strong to specialize into.
Classic versus Oddity XP
At creation you choose between two experience systems, and the choice shapes how you play more than it shapes raw power.
- Classic awards XP from kills, from lockpicking and hacking, and from quests. It rewards engaging with content directly — clearing rooms, cracking locks, finishing objectives.
- Oddity awards XP only from finding unique "oddity" items and from completing quests. It rewards exploration and curiosity, and it lets you avoid fights entirely if you would rather sneak past them.
The pacing differs too. An Oddity character typically reaches the major Depot A milestone around level 8 to 9, while a Classic character arrives there around level 12. Neither is strictly better. Oddity suits stealthy, exploration-minded play; Classic suits players who want to be rewarded for combat and tend to clear what they find.
Crafting is effectively mandatory
It is tempting to treat crafting as optional flavor. It is not. In UnderRail, crafted gear reliably outclasses what you buy from merchants or pull off corpses. Serious builds craft their weapons, armor, bolts, and grenades, and they invest the relevant Intelligence skills to do it.
The key lever is component quality. Items are assembled from components, and high-quality components produce dramatically better gear — but they are rare and demand high crafting skill to use well. By roughly level 10, if you have invested in crafting at all, low-quality components are simply not worth using. Crafting happens at workbenches, which you will find throughout the world.
-
1
Pick one crafting skill to anchor your gear
Match it to your build — Mechanics and Electronics for guns and crossbows, Tailoring for armor, Chemistry and Biology for bolts, grenades, and consumables.
-
2
Raise it alongside your damage skill, not after
Keep your chosen crafting skill near its cap as you level so you can use the better components you find rather than wasting them.
-
3
Hoard high-quality components
High-quality parts are rare. Buy them when merchants stock them and save them for the gear that matters most to your build.
-
4
Assemble at workbenches and upgrade as quality climbs
By around level 10, stop crafting from low-quality components if you have invested in the skill — the difference in output is too large to ignore.
Because crafting amplifies almost every archetype, the points you spend on it are rarely wasted. A focused damage build that also crafts its own gear is far stronger than the same build shopping for one.
Putting it together
Every thread ties back to one idea: UnderRail rewards a coherent, focused character.
Choose your stats around a single damage style and leave unused stats at 4 rather than mining them down to 3. Spend your 40 points per level on a tight set of skills instead of dabbling, and check the synergy table before you allocate. Buy feat prerequisites with real skill points, because bonuses will not qualify you. Lean your Expedition specializations into strengths you already have. Pick the XP system that matches how you like to play, and invest in crafting from the start.
Do that and the permanence of the system becomes a strength rather than a trap.
If you want a step-by-step walkthrough of the opening hours and the creation screen, read the UnderRail beginner guide. To compare concrete archetypes and decide where to start, see the UnderRail build guide. For the psi schools in detail, see the UnderRail psi guide.
