Invisible Fortress:House rules

House rules

Flanking

Flanking will be available to players and monsters in this campaign. However, instead of advantage as per the optional flanking rule listed in the DMG, flanking will give +2 to attack rolls. This allows for tactical movement, without invalidating race or class features such as Pact Tactics and Reckless Attack.

You have flanking if you are within 5ft of your target, there is a creature who is an enemy of your target (not necessarily your ally) which is not incapacitated, and the line between the center points of your occupied space and the other creature's occupied space crosses opposite sides of the target's occupied space, or opposite corners of the target's occupied space.

• 
  Two characters on opposite sides of a large enemy
• 
  The stunned character cannot provide flanking, because they are incapacitated
• 
  The line passing between the top edge and right edge does not result in flanking

Line of sight and cover

In order to have line of sight on a target, you must be able to trace a line from any corner of your occupied space to any corner of any square of the target's occupied space, without crossing into a square of blocking terrain. Creatures in your path do not block line of sight.

• 
  The red line has to pass through the wall to reach the goblin

To determine cover from a ranged attack, select one corner of your occupied space and trace four lines from it to the four corners of one square in the target's occupied space. If one or two of the lines cross into blocking terrain or an enemy creature, the target has half cover (+2 AC and Dex saves). If three of the lines cross into blocking terrain, the target has three quarters cover (+5 AC and Dex saves). Creatures cannot result in three quarters cover, only half cover.

Cover from melee attacks and area effects work similarly to ranged attacks, except that creatures cannot provide cover against them.

• 
  Only one line is blocked by a wall, so the creature has half cover
• 
  Three lines are blocked by a wall, so the creature has three quarters cover
• 
  One line to the goblin is blocked by a wall (half cover), and one line to the troll is blocked by the goblin (half cover), while the ally does not provide cover to the bugbear
• 
  Cover from area effects is measured from the origin point of the area, and no creature provides cover from it