Rules debated on 4/27 Concentration, Cover

[Jack Napier]

Concentration:

Spell-casters: your concentration is d20+caster level+ability score mod for casting.

The DC varies depending on the situation, but to cast defensively the DC is 15 + double spell level. This is TOUGH to do so don't waste your action if you can do something safer/more effective.... like take a five foot step backwards and cast. Combat casting as a feat makes concentration a little easier to do (+4 on concentration checks while casting defensively or while grappled)


Cover... which is what taking ranged shots through occupied squares entails. Shots through occupied squares provide soft cover to your target, granting them a +4 bonus to AC. It is NOT a -4 on attack (though it effectively does the same thing) and nowhere does it say it stacks with each occupied square shot through. I have made the section BOLD.

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The Official rules (copied from Pathfinder SRD)

Concentration:

To cast a spell, you must concentrate. If something interrupts your concentration while you're casting, you must make a concentration check or lose the spell. When you make a concentration check, you roll d20 and add your caster level and the ability score modifier used to determine bonus spells of the same type. clerics, druids, and rangers add their Wisdom modifier. Bards, paladins, and sorcerers add their Charisma modifier. Finally, wizards add their Intelligence modifier. The more distracting the interruption and the higher the level of the spell you are trying to cast, the higher the DC (see Table: Concentration Check DCs). If you fail the check, you lose the spell just as if you had cast it to no effect.

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Cover

To determine whether your target has cover from your ranged 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 (+4 to AC).

When making a melee attack against an adjacent target, your target has cover if any line from any corner of your square to the target's square goes through a wall (including a low wall). When making a melee attack against a target that isn't adjacent to you (such as with a reach weapon), use the rules for determining cover from ranged attacks.

Low Obstacles and Cover

A low obstacle (such as a wall no higher than half your height) provides cover, but only to creatures within 30 feet (6 squares) of it. The attacker can ignore the cover if he's closer to the obstacle than his target.
Cover and Attacks of Opportunity

You can't execute an attack of opportunity against an opponent with cover relative to you.

Cover and Reflex Saves

Cover grants you a +2 bonus on Reflex saves against attacks that originate or burst out from a point on the other side of the cover from you. Note that spread effects can extend around corners and thus negate this cover bonus.

Cover and Stealth Checks

You can use cover to make a Stealth check. Without cover, you usually need concealment (see below) to make a Stealth check.

Soft Cover

Creatures, even your enemies, can provide you with cover against ranged attacks, giving you a +4 bonus to AC. However, such soft cover provides no bonus on Reflex saves, nor does soft cover allow you to make a Stealth check.

Big Creatures and Cover

Any creature with a space larger than 5 feet (1 square) determines cover against melee attacks slightly differently than smaller creatures do. Such a creature can choose any square that it occupies to determine if an opponent has cover against its melee attacks. Similarly, when making a melee attack against such a creature, you can pick any of the squares it occupies to determine if it has cover against you.

Partial Cover

If a creature has cover, but more than half the creature is visible, its cover bonus is reduced to a +2 to AC and a +1 bonus on Reflex saving throws. This partial cover is subject to the GM's discretion.

Total Cover

If you don't have line of effect to your target (that is, you cannot draw any line from your square to your target's square without crossing a solid barrier), he is considered to have total cover from you. You can't make an attack against a target that has total cover.

Improved Cover

In some cases, such as attacking a target hiding behind an arrowslit, cover may provide a greater bonus to AC and Reflex saves. In such situations, the normal cover bonuses to AC and Reflex saves can be doubled (to +8 and +4, respectively). A creature with this improved cover effectively gains improved evasion against any attack to which the Reflex save bonus applies. Furthermore, improved cover provides a +10 bonus on Stealth checks.