Cover

Asteroids, ships, debris, and other obstacles can provide cover during combat, making a target more difficult to harm. A target can benefit from cover only when an attack or other effect originates on the opposite side of the cover.

There are four degrees of cover. If a target is behind multiple sources of cover, only the most protective degree of cover applies; the degrees aren't added together. For example, if a target is behind a ship that gives half cover and an asteroid that gives three-quarters cover, the target has three-quarters cover.

A target with one-quarter cover has a +2 bonus to AC and Dexterity saving throws. A target has one-quarter cover if an obstacle blocks at least one-fourth of it.

A target with half cover has a +3 bonus to AC and Dexterity saving throws. A target has half cover if an obstacle blocks at least half of it.

A target with three-quarters cover has a +5 bonus to AC and Dexterity saving throws. A target has three-quarter cover if about three-quarters of it is covered by an obstacle.

A target with total cover can’t be targeted directly by an attack or a power, although some powers can reach such a target by including it in an area of effect. A target has total cover if it is completely concealed by an obstacle.