ToME: the Tales of Maj'Eyal

This addon is for those who want to use the old FoV/LoS system that ToME used for most of its beta releases. The old algorithm is asymmetric and less permissive than the current default algorithm. Sometimes an actor (the PC or an NPC) will be able to see and attack an enemy that is unable to target back due to the asymmetry.

http://te4.org/games/addons/tome/old-as ... ov-and-los