YOU SAID:
Begone from my marsh area you unholy being
INTO JAPANESE
あなたが不浄な私の沼地から立ち去る
BACK INTO ENGLISH
You leave my unclean swamp
INTO JAPANESE
あなたは私の汚れた沼を去る
BACK INTO ENGLISH
You leave my dirty swamp
INTO JAPANESE
あなたは私の汚い沼を去る
BACK INTO ENGLISH
You leave my dirty swamp
That didn't even make that much sense in English.