Line of sight
The default line of sight (LOS) in Crawl is a 15x15 square
There are some ways to modify your line of sight:
- The spell Darkness reduces LOS by 25%. The same effect is also provided by the shadow card and the Robe of Night.
- The nightstalker mutation reduces LOS by 1, 2, or 3 tiles depending on rank.
The following drawing shows fields within the default field of view with their grid distance.
777777777777777 766666666666667 765555555555567 765444444444567 765433333334567 765432222234567 765432111234567 7654321@1234567 765432111234567 765432222234567 765433333334567 765444444444567 765555555555567 766666666666667 777777777777777
Prior to 0.17, line of sight was circular with a radius of about 8.
In 0.7, the developers made an undocumented change to the LOS. Ranges are circular now, so every spell and ability that reaches a set distance got about two squares lopped off the diagonals. Stealthy characters can now reach their target in 5 squares (instead of 8) at certain angles.