Star metal can be obtained by mining meteors that land all over the snowy area 12-13 D-E on your map grid. If you set your graphics settings- effects quality and view distance to the max you can spot these meteors easier by the black smoke the emanate. After you get the ores, place them into a furnace with black ice and brimstone to get the bars.
For obsidian, go to the volcano area and mine obsidian ores. After you get the ores, you need to go to the volcano inner area through a teleport and reach the forge there, where you place the obsidian ores with steel bars and turn them into composite bars.
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