Mortal Shell II punishes players who treat it as a generic souls-like. The systems below are the ones that change how fights go, and every rule here is taken from the game's own explanation of it rather than from someone's impressions.
1. Perfect Guard is the whole defensive game
Guarding just before an attack would land executes a Perfect Guard. It costs no guard energy and it builds the enemy's Break meter. String consecutive Perfect Guards together and the enemy Breaks, leaving them open to a Riposte.
That is the core loop: the same button that keeps you alive is also your main way of opening enemies up. Blocking early is safe but does nothing; blocking late is what actually wins the fight.
2. Losing your shell is not death
When your connection to a shell is severed you are not dead — you have one chance to get it back. Wound enemies with melee attacks to reclaim it, and watch your Seal to track how close you are.
New players panic and run at this point. Running away is the one thing that guarantees you lose the shell: you need to hit something.
3. Enemies are not all weak to the same thing
The game tells you plainly that some enemies are more vulnerable to certain attacks, and to experiment with Light, Heavy and Ranged. What it doesn't tell you is the numbers — but those are in the files, and every enemy in this database has its exact resistances to Bleed, Frost, Shock and Curse.
Rank every enemy by what they're weak to4. Spend gloom, but know what it buys
Gloom is both your currency and, in the fiction, fuel for what you are. Spending it to level up grants Shell Points, and your Shell Points Capacity decides how many abilities you can have active at once. Shell abilities themselves sit behind a Bond Tier, so raising your bond with a shell is what unlocks its kit — not just raw levels.
5. Upgrade one weapon, not four
Weapon upgrades run from +0 to +25 through the Tarforge, and the gold cost is the same curve for every weapon. Taking a single weapon all the way costs 130,400 gold plus 31 units of each of the five crafting materials. Spreading that across several weapons early is the most common way to end up under-levelled for a boss.
Tarstones are the other half of your build, and levelling them from 2 to 3 needs Tarcore, which drops from levelling tarstones in the first place.
Work out the exact cost of an upgrade6. Read the fast travel warning
Fast travel uses Mether's Breath, and the game asks you to confirm because using it spends all of your gloom. That prompt is easy to click through on autopilot. Bank or spend your gloom before you travel.
Every rule on this page comes from the game's own tutorial text, extracted from the build. You can read all of them, unedited, in the mechanics section.
All 24 game mechanics explained