PyuTest.lightning_strike = function(pos, radius, size)
  local s = size or 40

  core.add_particlespawner({
    amount = 1,
    time = 0.4,

    -- make it hit the top of a block exactly with the bottom
		minpos = {x = pos.x, y = pos.y + (s / 2) + 1/2, z = pos.z },
		maxpos = {x = pos.x, y = pos.y + (s / 2) + 1/2, z = pos.z },

		minvel = {x = 0, y = 0, z = 0},
		maxvel = {x = 0, y = 0, z = 0},
		minacc = {x = 0, y = 0, z = 0},
		maxacc = {x = 0, y = 0, z = 0},
		minexptime = 0.2,
		maxexptime = 0.2,
		minsize = s * 10,
		maxsize = s * 10,
		collisiondetection = true,
		vertical = true,
    texture = "pyutest-lightning.png",
    glow = core.LIGHT_MAX,
  })

  core.sound_play("pyutest-thunder", {
    gain = 2,
    pos = pos
  })

  local r = radius or 3
  for o in core.objects_inside_radius(pos, r) do
    PyuTest.deal_damage(o, 12, PyuTest.DAMAGE_TYPES.lightning())
  end

  for x = -r, r do
    for z = -r, r do
      local y_pos

      if core.get_node(pos).name ~= "air" then
        y_pos = pos.y + 1
      elseif core.get_node(pos - vector.new(0, 1, 0)).name ~= "air" then
        y_pos = pos.y
      end

      if y_pos then
        local npos = vector.new(pos.x + x, y_pos, pos.z +z)
        if math.random(1, 6) == 1 then
          core.set_node(npos, {name = "pyutest_blocks:fire"})
        end
      end
    end
  end
end