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Chapter 8: Tactical Rules / Combat Modifiers

Cover

Source Starfinder Core Rulebook pg. 253
Cover does not necessarily block precise senses, but it does make it more difficult for enemies to hit you. To determine whether your target has cover from your attack, choose a corner of your square. If any line from this corner to any corner of the target’s square passes through a square or border that blocks line of effect or provides cover, or through a square occupied by a creature, the target has cover. Cover grants you a +4 bonus to AC and a +2 bonus to Reflex saves against attacks that originate from a point on the other side of the cover from you. Note that spread effects can extend around corners and negate these bonuses.

Cover And Attacks Of Opportunity

If you have cover relative to an enemy, it can’t make an attack of opportunity against you.

Low Obstacles And Cover

A low obstacle (i.e., a wall half your height) provides cover, but only to creatures within 30 feet (six squares). The attacker ignores the cover if he’s closer to the obstacle than his target is.

Soft Cover

Creatures, even enemies, between you and the source of an effect provide you with cover against ranged attacks, giving you a +4 bonus to AC. However, soft cover provides no bonus to Reflex saves, nor does soft cover allow you to attempt a Stealth check.

Partial Cover

If more than half of you is visible, your bonuses from cover are reduced to +2 to AC and +1 to Reflex saving throws.

Improved Cover

In some cases, such as when a target is hiding behind a gun port in a defensive wall, cover provides greater bonuses to AC and Reflex saves. In such situations, the normal bonuses to AC and Reflex saves are doubled (to +8 and +4, respectively).

Total Cover

If an enemy doesn’t have line of effect to you (see page 271), you have total cover from the enemy. A creature can’t make an attack against a target that has total cover.