Status effects run in both directions in Mortal Shell 2. You can stack them onto enemies to melt health bars or break posture faster, and enemies, bosses, and hazards can stack the same effects onto you. Fifteen of them exist, and each one behaves differently depending on how many stacks are sitting on the target.
Quick answer: Every ailment builds in stacks, and stacks either extend the duration, raise the intensity, or both. You apply them through Shell abilities and Tarstones, and you clear them off yourself with equipable cure items like Tarspore for Poison or Burnt Effigy for Burn.
All status effects and elemental ailments
Some of these are pure damage, some change how much damage a target takes, and two are buffs that only ever apply to you. The type column below is a quick way to sort out what a stone or ability is going to do before you commit resources to it.
| Effect | Type | What it does |
|---|---|---|
| Burn | Damage over time | Deals accumulated damage over a duration. |
| Poison | Damage over time | A long-lasting damage-over-time effect. |
| Lightning | Damage over time | Ticks damage, and enough stacks set off an explosion. |
| Bloodcurse | Burst | Detonates for massive damage once it hits the stack threshold. |
| Trauma | Break damage | Applies Break damage over time instead of health damage. |
| Phantom | Delayed burst | Deals stored splash and Break damage after a delay. |
| Frost | Control | Freezes the affected target. |
| Stasis | Control | Slows movement, and more stacks slow it further. |
| Confusion | Control | Turns the target against its own allies. |
| Curse | Counter | Cancels the target’s next melee attack and reflects the damage back. |
| Fragile | Damage amp | Raises the damage the target takes from primary weapons. |
| Perforation | Damage amp | Raises the damage the target takes from Sidearms. |
| Weak | Damage cut | Lowers the damage the affected target deals. |
| Leech | Self buff | Kills grant stacks that raise your Max Health. |
| Shadow | Self buff | Turns you invisible. |
Alongside those, the game hands out a set of plainly named buffs such as Increased Attack Damage, Damage Reduction, and Poison Immunity. They do exactly what the label says and don’t need decoding.
How the stack system works
Nothing here is a simple on/off toggle. Each ailment tracks a stack count on the target, and that count decides how long the effect lingers, how hard it hits, or both at once. Stasis is the clearest example on the slowing side, since piling on stacks makes the slow progressively worse.
Threshold effects work differently. Bloodcurse and Lightning sit quietly until the bar fills, then dump their payload all at once. That matters for build planning, because a fast weapon that applies small amounts constantly will reach those thresholds far more often than a slow one.
Note: Every ailment has its own stack rules, so read the in-game description on the specific Tarstone or ability before you assume it scales the way another one does.
Where ailments come from: Tarstones and Shell abilities
Two systems supply nearly everything on the list. Shell abilities carry ailments as part of their skill trees, and Tarstones either apply an effect passively or attach one to your weapon. Enemies and bosses draw from the same pool and will put these effects on you.
Passive stones need no input at all. Wounding Stone is the reference case, applying Perforation simply by being equipped, which is why it pairs neatly with a Sidearm-heavy setup.
Infusion Tarstones are the other half. Arbiter’s Prize, which inflicts Bloodcurse, has to be applied to a weapon through Infusion before it does anything. Infusions cost Resolve and initially last only for a handful of strikes or shots, so you’re spending a resource each time you want the effect back.
That limitation goes away with investment. Once a stone has enough EXP, Coin, and Tarcores behind it, its infusion becomes permanent while equipped, and the weapon simply keeps applying the effect without recharging. Voltaic Crown shows the jump clearly, moving from a limited number of lightning strikes at Level 2 to a permanent infusion at Level 3.
How to cure Burn, Poison, Frost, and other ailments
Instead of a bag of one-use antidotes, the game uses Permanent Pickups. These are equipable items that stay in your inventory forever, and each one can be slotted as either an active effect or a passive one. Weltcap is the simplest example, healing you over a long duration or trickling health back up to a minimum threshold depending on which option you pick.
Several of them exist purely to shut down a specific ailment. Each cures the effect outright and helps blunt it afterwards.
| Item | Ailment it cures and mitigates |
|---|---|
| Burnt Effigy | Burn |
| Tarspore | Poison |
| Martyr’s Ash | Frost |
| Galvanic Shard | Lightning |
| Bloodseed | Bloodcurse |
| Paradoxical Scripture | Stasis |
Duplicates are worth grabbing. Collecting more copies of the same pickup unlocks higher tiers of its effects, with Tier I on the first one, Tier II at ten total, and Tier III at fifty.
Using Shells for ailment immunity
Cure items aren’t the only defense. Shells carry their own resistances, and pushing Shell Points into the right branch can take you from resistant to fully immune. Tiel reaches complete Poison immunity with enough investment, and Eredrim can be built for Frost immunity the same way.
Respeccing is free and takes a button press, and Shell Points are account-wide. If you’re walking into an area or boss that leans hard on one element, refund your points, rebuild into the matching immunity, and switch back afterwards. That flexibility makes ailment defense something you adjust per fight rather than a permanent build decision.
The practical takeaway is that ailments reward specialization on both ends. Pick one or two effects your weapon and Shell can apply consistently, level the stones that carry them so the infusions stop costing Resolve, and keep the matching cure items slotted for whatever the world is throwing back at you.
