ToME: the Tales of Maj'Eyal

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local actor = game.level.map(x, y, Map.ACTOR)

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-- A radius 1 ball attack with range 3.
local tg = {type = 'ball', range = 3, radius = 1,}
-- Get the player to select an x/y location, showing an overlay for a radius 1 ball.
local x, y = self:getTarget(tg)
-- Cancel out without taking an action if the player cancelled.
if not x or not y then return end
-- This does 2 things. First, it picks a closer square if the targeted square is out of range (3, in this case).
-- Second, if we target a wall, this'll give us the coordinates one tile before the wall, as that's where ball attacks blow up.
-- The second and third returns are the actual wall coordinates (or the same if there's no wall in the first place).
local _, _, _, x, y = self:canProject(tg, x, y) 
-- This sends out the actual effects to all targeted.
self:project(tg, x, y, function(x, y)
  -- Get the targeted actor.
  local actor = game.level.map(x, y, Map.ACTOR)
  -- Cancel if there's nothing there.
  if not actor then return end
  -- Do whatever with the actor.
  actor:die()
end)

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local targets = {}
self:project(tg, x, y, function(x, y)
  local actor = game.level.map(x, y, Map.ACTOR)
  table.insert(targets, actor)
end)
-- Do something with targets here.

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action = function(self, t)
        local tg = {type="bolt", range=self:getTalentRange(t), talent=t}
        local x, y, target = self:getTarget(tg)