Ostrava has the key to the mausoleum in Boletarian Palace. Normally you would have to save his life three times to get the key, but he mainly gives you useless items. You can kill him the first time you meet him. You can then take the key. He is very easy to kill. This is useful for new players, as there is a chance that Ostrava can die while you are playing and you will then lose your chance at getting the key.