What are Black Omen cards?

Hello, I am new to the ThirdStyle engine and I noticed that after I finished playing through some songs I would gain "Black Omen" cards and "Achievements", I don't know what these two things do and I don't seem to be able to access them in game or in my profile so I'm now requesting some direction from someone more experienced.
Oh yeah, also if there's a way to play custom simfiles like in stepmania pleeease let me know because that would be neat js.-.


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