Editing Custom Rules (section)

== Flanking ==

When a creature and at least one of its allies are positioned on opposite sides of a hostile creature, they may gain a +2 attack bonus in melee combat.

Requirements:

* Opposite Sides: You and an ally must each be within 5 feet of the same hostile creature, and you must be able to draw a line through the center of the hostile creature’s space that intersects both your spaces. (This can be determined using a grid or theater of the mind as appropriate.)
* Engaged Foe: The hostile creature must have focused attention on your ally—typically indicated by having made an attack against, cast a spell targeting, or otherwise directly interacted with that ally during its last turn.
* Weapon Range: You must be making a melee attack against the foe.

Effect: You gain a +2 bonus to your attack roll against the flanked creature.

Exceptions: Some creatures are particularly aware of their surroundings and are immune to flanking. This includes creatures with Blindsight, Tremorsense, or Truesight or with multiple heads or multiple eyes. Other creatures may posses abilities that provide  full peripheral awareness that also prevent flanking.

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