They combine the gem with the tablet to close the portal , and save the city .
In the end , though , the Ghostbusters manage to defeat Janna , the God of Darkness , and retrieve a mystical gem from the evil world .
Ghostbusters combine the gem with the tablet to close the portal , and save the city .
In the end , though , the Ghostbusters manage to defeat Janna , the God of Darkness , and retrieve a mystical gem from the evil world .