if (instance_exists(obj_battle_enemy_attack_trihecta_circle_stack_lead))
{
    if (obj_battle_enemy_attack_trihecta_circle_stack_lead.started == true)
    {
        var j = 2;
        i = ds_list_size(x_list) - 1;
        while (i >= 0)
        {
            var x0 = ds_list_find_value(x_list, i);
            var y0 = ds_list_find_value(y_list, i);
            var image_alpha_trail = 1 / j;
            draw_sprite_ext(trail_sprite, 0, x0, y0, 1, 1, 0, c_white, image_alpha_trail);
            j += 1;
            i -= 1;
        }
    }
}
draw_sprite_ext(sprite_index, image_index, x, y, 1, 1, 0, c_white, image_alpha);