Why do my missiles sometimes just miss completely?

Missiles can be intercepted by Point-Defense weapons. If the enemy fleet is loaded with point-defense, your missile hit rate will drop noticeably — pair missiles with other weapon types to spread out their interception capacity.

Are armor-penetrating weapons always better than regular weapons?

No. Armor-penetrating weapons are strong against armor specifically, but do little against shields. If the enemy is shield-heavy, an armor-penetrating loadout is actually a worse pick.

Stellaris Weapon Types Explained: Kinetic, Energy, and Missiles Compared

In Ship Design Basics we covered range tiers and armor/shield ratios at a high level. This guide breaks down the individual weapon types in more detail.

Kinetic weapons: reliable baseline damage

Kinetic weapons (autocannons, mass drivers) have consistent accuracy and some innate bonus against armor. They’re cheap to get early and offer solid value throughout the early-to-mid game — their main drawback is short range, which leaves them vulnerable to being kited by longer-range weapons.

Energy weapons: lasers and ion cannons

Energy weapons (lasers, ion cannons) deal steady damage without being specifically countered by either armor or shields — the “no obvious weakness” choice. They perform reliably at mid range and are a mainstay in most balanced fleet compositions.

Missiles and torpedoes: high damage, but interceptable

Missile-class weapons hit hard at long range, but they can be shot down by Point-Defense weapons. If the enemy fleet is running heavy point-defense, your actual missile damage output will fall well short of the numbers on paper. If you’re leaning on missiles, keep an eye on how much point-defense the enemy is fielding.

Armor- and shield-penetrating weapons: situational picks

Some weapons are specifically built to counter armor or shields, with a significant damage bonus against that defense type — and almost nothing against the other. These aren’t a “safe default” pick; they should be chosen based on scouted intel about the enemy fleet, and swapping them in at the right moment is one of the highest-value tweaks in fleet design.

A simplified decision guide

No intel on the enemy: a balanced kinetic + energy mix is the safest default.
Enemy is armor-heavy: increase your share of armor-penetrating weapons.
Enemy is shield-heavy: increase your share of anti-shield weapons, or lean harder into your own armor-penetrating loadout.

For how to lay these weapons out across specific hull slots, go back to Ship Design Basics and apply the range-tier principle. For defensive module choices on your border starbases, see the Starbase wiki entry.