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D&D 5E – Playing on a 1 Square=10′ Grid
March 19, 2020Posted by on
How to Play on a 1 inch = 10 feet square grid.
I am the DM for a table top “Storm King’s Thunder” campaign. The final battle map is drawn in the book with one square = 10 feet. I usually draw the map on my battlemat with each 1 inch square = 5 feet. But this is such a large playing field that it won’t fit on my table at that scale so I am drawing it with 1 inch = 10 feet. I have occasionally done this before, but adjusting movements and attacks have always been a hassle. In anticipation of a large complicated battle I came up with this set of house rules.
To play with miniatures on a square grid where each square on the grid represents 10 feet:
Start with the rules in Variant: Playing on a Grid (PHB, page 192). Change “Each square on the grid represents 5 feet” to “Each (one inch) square on the grid represents 10 feet.”
For game purposes, creature sizes and speeds don’t change and if they have a 5 ft. reach they can attack creatures in adjacent squares even though creatures in adjacent squares are considered to be 10 ft. apart for all other purposes.
– Gargantuan Creatures
These each occupy a 2 inch square (four 1 inch squares).
– Large or Huge Creatures
These each occupy a single 1 inch square.
– Medium and Small Creatures
You can have more than one medium or small creature in one square. (I recommend flat, one inch diameter, tokens rather than minis. If there is more than one creature in a square you can stack them.)
A medium or small creature occupies one 1 inch square. Up to 4 creatures of this size can occupy a single square, but they are each considered occupying the entire square. If there is more than one such creature in a square they are considered to be 5 feet apart from each other.
A single medium or small creature can not be attacked by more than 8 medium or small creatures (or 4 large or larger creatures) with 5 ft. melee attacks.
– Tiny Creatures
You can stack 16 tiny creatures in one square. They are considered to be 2 1/2 ft. apart. You can have a combination of tiny and medium or small creatures. There can be a maximum of: 1 medium or small and 12 tiny, 2 medium or small and 8 tiny, or 3 medium or small and 4 tiny.
Speed and movement doesn’t change, but you can’t move into a square if you don’t have enough movement left (10 feet).
Example: If your move rate is 25 feet, you can only move 2 squares (25 ft. rounded down = 20 ft.), but if you dash you can move 5 squares (25 ft. x 2 = 50 ft.).
Medium or small creatures can move through, but not stop in, a square occupied by a Gargantuan or Huge creature but it can’t move through a square occupied by a Large creature.
Medium or small creatures can move through, or stop in if they choose to, a square occupied by fewer than 4 medium or small creatures, regardless if the occupying creatures are hostile or not. If it is occupied by 4 non-hostile creatures you can move through it but you can not stop in it.
Ranges and areas of effect:
All ranges and areas of effect are rounded down to a multiple of 10 feet (minimum of 10 feet).
Some examples: All melee attacks with a range of 5 feet will have a range of 10 ft. (or, rather, they are treated as if they were actually only 5 ft. away.) So you can attack a creature in an adjacent square with your short sword, or you could attack it with your long bow without disadvantage because, for everything other than 5 ft. melee attacks, it is 10 ft. away. For the same reason an attack on a prone creature in an adjacent square is with advantage if you make a 5 ft. melee attack (it’s 5 ft. away), but it is with a disadvantage if it is made with range weapon (it’s 10 ft. away). A blowgun’s range changes from (25/100) to (20/100). The spell Word of Recall‘s range changes from 5 ft. to 10 ft. The spell Lightning Bolt will form a line 10 ft. wide instead of 5 ft. The Gust of Wind spell will push a creature 10 ft. instead of 15 ft.
Your 5 ft. reach becomes 10 ft. in regard to creatures in adjacent squares. So if a hostile creature moves out of an adjacent 10 ft. square you can make an opportunity attack against it. But if it moves from within the same square you are in to an adjacent square you can not (because it will still be within range).