Voadam
Legend
Got it.I am using the "Make a Template" method. You create a template for Lightning Bolt, 1 inch wide, 20 long. Then apply it to the grid as per XGtE (p.86):
XGtE 86:
"This section offers two alternatives for determining the exact location of an area: the template method and the token method. Both of these methods assume you're using a grid and miniatures of some sort. Because these methods can yield different results for the number of squares in a given area, it's not recommended that they be combined at the table choose whichever method you and your players find easier or more intuitive."
It is dissapointing the core rules left this type of area of effect coverage on a grid ambiguous. Its not like they didn't have experience since 2000 across 3e, 3.5, and 4e grids to draw on.