Reach of 0.

[shallowsoul]

Does this mean that a creature with a reach of 0 needs to enter your square in order to hit you?

[Oladon]

PRD: Combat wrote:

Creatures that take up less than 1 square of space typically have a natural reach of 0 feet, meaning they can't reach into adjacent squares. They must enter an opponent's square to attack in melee. This provokes an attack of opportunity from the opponent. You can attack into your own square if you need to, so you can attack such creatures normally. Since they have no natural reach, they do not threaten the squares around them. You can move past them without provoking attacks of opportunity. They also can't flank an enemy.

[Skeld]

shallowsoul wrote:

Does this mean that a creature with a reach of 0 needs to enter your square in order to hit you?

Yep. And they provoke when doing so.

Stirges are a great example.

-Skeld

[redward]

How does that work with this?

PRD wrote:

Ending Your Movement: You can't end your movement in the same square as another creature unless it is helpless.

[Grick]

redward wrote:

How does that work with this?

PRD wrote:

Ending Your Movement: You can't end your movement in the same square as another creature unless it is helpless.

Moving Through a Square: "Very Small Creature: A Fine, Diminutive, or Tiny creature can move into or through an occupied square. The creature provokes attacks of opportunity when doing so."

It's generally assumed that the rule for very small creatures is more specific than the general rule about occupying a square.

It's unclear if this is a rule for all tiny and smaller creatures (they can share a square with any creature of any size) or if the 'three-size-difference' rule must be observed. (Preventing a tiny stirge from attacking a halfling, but not a human)

-edit- if you're small or larger, with 0' reach, you're pretty much hosed.

[SCPRedMage]

A bit of necro with this post, but I figure this might need some insight...

Grick wrote:

It's unclear if this is a rule for all tiny and smaller creatures (they can share a square with any creature of any size) or if the 'three-size-difference' rule must be observed. (Preventing a tiny stirge from attacking a halfling, but not a human)

Tiny and smaller creatures can share a square with creatures of any size because they're small enough to co-exist with things that would normally occupy the full square. At this size, it's the size of the square that's the factor that allows them to be in the same space.

Meanwhile, creatures that are Huge and larger are large enough that the portions of their space that they don't physically occupy is large enough that smaller creatures can potentially stand there; at this size, it's the size of the creature that's the factor.