One thing to keep in mind is that the origin point is usually not placed on a cross-section of squares. You could follow the rules in the book (XGtE has more explanations for area of effects on a grid), or you could use 1/6 of a circle as the area for maximum accuracy.Ĭones on the left are more accurate for "real world" representations, but the cones on the right are what is commonly agreed upon for tabletops. A spell works how you want it to, at the end of the day.Īre you saying the circles represent spheres? Because I thought the whole graphic was for cones from different angles (the circles being cones fired from above).Ĭones don't work well on a grid. However, if you feel that it is not the best way to use the spell then change it. The DMG includes how AoEs work and includes tips for using on a grid. It's up to you, the DM, to determine how well a cone/effect/whatever would apply to that situation and any outcome of it - which may include effects beyond the spell like damaging weak structures, altering guards, setting things on fire accidentally, or freezing waters or making a damp surface slippery for cold blasts. The grids/hexes and how cones/etc work on them is only designed as a quick reference not really to be overly specific. Outside of this it might be useful to remember that any "grids" or such battle maps are just "representations" only. It has templates for spheres, cubes, cuboids and cones. You can buy a spell templates pack on Roll20 for about $5 which lets you use transparent overlays to just drag and drop onto your map and see the area it covers. Playing on Roll20 so not an option for irl effects, sadly. The one on the left or the one on the right? On a grid, neither really reaches out 15ft away from the caster, because Pitagoras doesn't apply to fantasy grid worlds apparently. Which would be the correct 15ft diagonal cone.
Thus 5ft away from the point of origin it is 5ft wide, 10ft away is 10ft wide and so on till you reach the max cone range. Also a Cone will extend up to the specified range and at any point, it's width matches it's length. A cone's area of effect specifies its maximum length.Īs I understand it, a 10ft Sphere has a Radius of 10ft measured from an intersection, thus will cover any square that is at least 50% covered by the effect of the spell. A cone's width at a given point along its length is equal to that point's distance from the point of origin. A cone extends in a direction you choose from its point of origin.The sphere's size is expressed as a radius in feet that extends from the point. You select a sphere's point of origin, and the sphere extends outward from that point.The diameter of the base of the cone should be equal to the height of the cone so the circles (from above) should have a diameter equal to the cone length, not a radius of the cone length.
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