Firing an E.G.O. costs two things: a flat Sanity (SP) amount and a bundle of Sin resources you generate during the fight. Go negative on Sanity and a third cost appears, which is the chance that the skill comes out as its Corrosion variant and starts swinging at your own line. That chance is not a vibe. It is a four-band table, and the floor is -45 SP, where Corrosion is guaranteed:
| SP after using the E.G.O. | Corrosion chance |
|---|---|
| 0 to -22 | 0% |
| -23 to -33 | 25% |
| -34 to -44 | 75% |
| -45 or lower | 100% |
Those are the published figures from the Limbus Company Wiki's E.G.O. gameplay page. One caveat worth carrying, because the source contradicts itself: the same page's prose says Sinners have a corrosion chance "whenever their Sanity is in the negatives", which is not what its own table says about the 0 to -22 band, and at least one player report claims a corrosion at -1. Treat the 0% band as the documented number rather than a promise, and do not plan a run around dipping to -20 on purpose.
Everything below is how to use that table.
The two costs of every E.G.O.
Activating an E.G.O. skill spends two things at once:
- Sanity (SP). Every E.G.O. has a flat Sanity cost. Firing it drains that Sinner's SP, which is the resource that feeds the table above.
- Sin resources. E.G.O. skills require a bundle of the seven Sins (Wrath, Lust, Sloth, Gluttony, Gloom, Pride, Envy). You do not carry these into a fight; you generate them during combat. Winning a clash or landing a skill of a given affinity produces one resource of that Sin. If you cannot pay the Sin cost, the E.G.O. is greyed out.
That second point is the one new players miss: you build toward an E.G.O. by playing the matching colors first. A Sinner leaning on Gloom and Pride skills is charging their Gloom/Pride E.G.O. by simply fighting. Plan your skill selection two turns ahead and the resource is ready when you want it.
Grade does not tell you the price
This page used to say the five grades were a rough proxy for Sanity cost. They are not, and the correction matters because it changes which E.G.O. you can afford to spam. SP cost is set per skill. Dustloop's E.G.O. comparison tables the actual figures, and the ranges overlap badly:
| E.G.O. | Sinner | Grade | SP cost |
|---|---|---|---|
| La Sangre de Sancho | Don Quixote | ZAYIN | 0 |
| Snagharpoon | Ishmael | ZAYIN | 0 |
| Legerdemain | Gregor | ZAYIN | 10 |
| Bygone Days | Yi Sang | ZAYIN | 15 |
| Ya Śūnyatā Tad Rūpam | Outis | TETH | 15 |
| Lifetime Stew | Sinclair | TETH | 15 |
| Capote | Ishmael | TETH | 20 |
| Fluid Sac | Faust | HE | 20 |
| Capote | Meursault | HE | 20 |
| Red Eyes (Open) | Ryōshū | HE | 25 |
| Dimension Shredder | Yi Sang | HE | 25 |
| Sunshower | Yi Sang | WAW | 35 |
Read the overlap: a TETH can cost the same 20 SP as an HE, a ZAYIN can cost 15 where another ZAYIN costs nothing, and the only clean statement is that the ceiling rises with grade. Note also that the same E.G.O. carries a different grade on different Sinners, Capote being TETH for Ishmael and HE for Meursault, which is why "my friend's Capote is TETH" is not an argument about yours.
Two practical consequences. A 0 SP ZAYIN is a free action you should be firing constantly, and the cheap ones are what keep a Sinner out of the negative bands at all. And the expensive end is where the table at the top of this page earns its keep: a 35 SP Sunshower fired at 10 SP lands the Sinner at -25, which is the 25% band, not the safe one.
[!NOTE] The Dustloop figures above are a long-standing community table rather than a patch note, and Project Moon has reworked E.G.O. costs before. Check the skill's own panel in game before you commit a plan to a specific number. The shape of the finding, that cost is per skill and not per grade, is what the wiki states directly.
What the grades actually govern
Grade is a slot and a power band, not a price tag:
| Grade | Role |
|---|---|
| ZAYIN | Cheap utility, early staples, small effects |
| TETH | Reliable workhorse damage and status application |
| HE | Stronger effects, real turn swings |
| WAW | Heavy hitters and key status enablers |
| ALEPH | Fight-ending nukes and signature mechanics |
Three rules hang off that column, and they are the ones that decide loadouts:
- One per grade. Each Sinner equips exactly one E.G.O. of each grade at a time, so a second WAW means dropping the first. Grade is the inventory slot.
- Grade is not the Abnormality's Risk Level. An E.G.O. derived from a WAW Abnormality can be TETH on a Sinner, and the same E.G.O. can sit at different grades for different Sinners.
- Your resistances come from the last E.G.O. you used, not from the whole loadout. At the start of an encounter the equipped ZAYIN's values apply, which is a detail worth knowing before you open a fight by firing something exotic.
Higher grade does not mean "always better". A ZAYIN that pays for itself and keeps your Sanity healthy is often more useful across a full Mirror Dungeon run than a WAW you can fire once before your team destabilizes.
NEEDS_REVIEW: the wiki notes that as of Season 7, WAW was the highest grade available to Sinners, which would make the ALEPH row above a grade that exists in the game's taxonomy rather than one you can equip. Season 8 "STÚDĬUM PUNCTUM" opened on September 17, 2026 and we could not confirm whether that still holds, so the row stays listed and flagged rather than quietly deleted or quietly promoted.
Sin affinity cuts both ways
E.G.O. also has an affinity that changes how much damage the user takes while the E.G.O. is "worn." Each Sinner has resistances (Fatal, Ineffective, Normal, Endure) across the seven Sins, and firing an E.G.O. can shift what you are weak to. Fire a Lust-affinity E.G.O. on a Sinner who is Fatal to Lust and you are asking to get deleted on the counter. Match your E.G.O. choices to the enemy's damage types, not just your own damage output.
Overclocking: paying to keep Corrosion pointed the right way
Here is the mechanic that most E.G.O. explainers skip, and it is the answer to "Corrosion hits harder, so why not use it on purpose?"
You can. Spend 1.5x the E.G.O. Resources and Sanity and you get a Stable Overclocked E.G.O.: the same effects and power as the Corrosion skill, with the [Indiscriminate] property removed, so it will not target your allies. That is the deliberate version of going berserk, and it is the reason a Corrosion-shaped payoff is a build option rather than only an accident.
Come up short on resources and you get the Unstable Overclocked version instead, which targets indiscriminately like ordinary Corrosion. The one mercy is that it can be cancelled, which ordinary Corrosion cannot.
So the full picture is three ways to fire the same skill: the normal Awakening Skill at listed cost, Corrosion at a probability you did not choose, and Overclock at 1.5x cost with the targeting problem bought out.
Corrosion, from the other side
A corroded Sinner goes out of control. Their skills become Corrosion variants, which are often stronger than the normal version but carry fixed or random targeting, your own line included. Sanity runs from +45 to -45, and the lower you sit the worse the odds in the opening table.
Two ways to read that:
- Defensively: keep Sanity above the -23 line on the Sinners you cannot afford to lose control of. Winning a clash raises SP and losing lowers it, so the team that clashes well is also the team that stays sane. Lean on skills and Identities that restore Sanity between engagements.
- Offensively: against a boss you are about to kill, a deliberate corrosion can be the play. If the fight ends this turn, an uncontrolled WAW hitting for maximum is a feature. And if you can afford 1.5x, Overclock gets you the same damage without the friendly fire.
When to actually fire
A short checklist before you press the button:
- Where does this land me on the table? Subtract the SP cost from current SP and read the band. Landing at -24 is a different decision from landing at -20.
- Can I afford the Overclock instead? If the Corrosion payoff is what you want, 1.5x resources buys it without the risk of hitting your own team.
- Does the affinity leave me exposed? Check the enemy's next attack type against the E.G.O.'s affinity resistances, and remember the resistance that applies is the one from the E.G.O. you just fired.
- Is this the turn it matters? E.G.O. burst is best spent breaking a staggered enemy or clearing a wave before it acts, not chipping a healthy target you could have out-clashed for free.
Building around E.G.O.
The teams that abuse E.G.O. well are built to feed it. Stack Sinners whose kit generates the Sin resources their best E.G.O. wants, keep at least one source of Sanity recovery so you are not perpetually sitting in the 75% band, and pick up E.G.O. Gifts in Mirror Dungeon that lower costs or reward status types you are already stacking. Our team-building guide covers which Identities pair with which E.G.O. affinities.
If you are just starting, do not over-think it: fire your 0 SP and cheap ZAYIN E.G.O. freely, watch the SP number against the table at the top, and save the expensive ones for the turn a fight actually hangs in the balance. New to the game entirely? Start with the beginner's guide, then come back here once clashes feel natural. For a wider look at whether the game is worth your time, our Limbus Company review has you covered.
Sources: the corrosion bands, the Overclock multiplier, the one-per-grade rule and the last-used resistance rule are from the Limbus Company Wiki's E.G.O. gameplay page; the per-skill SP costs are from Dustloop's E.G.O. comparison.
