Part of the Sea of Conquest Mechanics Series:

Combat Mechanics Hub: Damage types and rage (Start Here).

Attack vs Damage: The other stat pair people confuse.

Captain Equipment: Where Impact comes from.

Quick Answer

Impact is armour penetration. It determines how much of your damage gets through a target's armour rather than being absorbed by it. Higher Impact means more of your hit lands against armoured enemies.

That single sentence resolves most of the confusion around it, because the name suggests a generic "how hard you hit" stat and it is not one. Against an unarmoured or lightly armoured target, Impact does very little. Against a heavily armoured one, it can matter more than raw attack.

Honest caveat: no public formula exists for how Impact converts into penetration. Community consensus is consistent that more is better against armour, but the exact maths has not been published. Treat this as a directional rule, not a calculator.

Why It Matters

Armour reduces incoming damage. Impact reduces that reduction. So the value of Impact is entirely a function of what you are shooting at:

Target	Impact value
Lightly armoured player fleets	Low
Heavily armoured tanks and bait ships	High
Forts and garrisons	High
Sea monsters	High
Softened targets already near death	Negligible

This is why players get contradictory advice about it. Someone farming low-tier map content genuinely does not need Impact. Someone attacking a well-built defensive fleet absolutely does.

The Drowning Shortcut

Here is the part worth internalising, because it makes Impact partly optional.

Drowning damage ignores armour entirely. Not "reduces" — ignores. A Drowning build deals its 20%-of-ATK-per-second ticks at full value regardless of how armoured the target is.

Which means there are two ways to beat armour:

Stack Impact on a direct-damage build (Artillery, Cutthroat, Strategic), or
Bring Drowning, which sidesteps the problem entirely

If your fleet already has a Drowning ship for armoured targets, your Impact requirement drops substantially — you have a dedicated answer already. If your fleet is all direct damage, Impact is how you avoid being walled by tanks. See the ship builds guide for both approaches.

Where Impact Comes From

Impact appears as a stat on ship parts and hero trinkets, and via some hero skills.

Because it comes from gear rather than permanent investment, it is cheap to change. You can build into it for a phase of content and out of it later, which is a good reason not to agonise over the decision.

Remember the percentage rule: on ship parts, percentage stats beat flat stats every time. A flat Impact bonus that looked meaningful at ship level 12 is noise at 32.

When to Stack It

Stack Impact when:

Your damage is visibly being absorbed — big attack numbers, small results
You fight forts, garrisons or sea monsters regularly
You run direct-damage builds with no Drowning ship
You are in PvP against developed accounts with real armour

Do not stack Impact when:

You already field a Drowning ship for armoured targets
Your content is low-tier map clearing
You are choosing between Impact and completing a set bonus — take the set

The Defensive Mirror

If Impact is how you beat armour, the reverse question is what protects you.

Not armour, mainly. Critical Resistance is the higher priority at level, because the crit multiplier does more damage than base hits once opposing fleets crit consistently, and armour does nothing about a multiplier. Green gems supply it — see the captain equipment guide.

So the honest defensive stack order is roughly: effective health, then Critical Resistance, then armour — and accept that a Drowning attacker will get through regardless.

FAQ

What is Impact in Sea of Conquest?

Armour penetration — it determines how much of your damage bypasses a target's armour rather than being absorbed.

Should I stack Impact?

Against armoured targets like forts, tanks and sea monsters, yes. Against lightly armoured targets it does very little.

Does Impact increase my damage?

Only against armour. It does not add damage; it stops damage being subtracted.

Do I need Impact if I run a Drowning ship?

Much less. Drowning ignores armour entirely, so it solves the same problem a different way.

Where does Impact come from?

Ship parts, hero trinkets and some hero skills — all gear-based, so it is cheap to change.

What is the defensive equivalent?

Critical Resistance, which at higher levels matters more than armour because it cuts the crit multiplier.

Key Takeaways

Impact is armour penetration, not a general power stat.
Its value depends entirely on the target. High against armour, near-zero against soft ones.
Drowning ignores armour, which is an alternative to stacking Impact.
It comes from gear, so building in and out of it is cheap.
Critical Resistance is the defensive priority, not armour.

Sea of Conquest Impact Explained: It's Armour Penetration