While trying to use RUFUS to install an UBUNTO ISO to my flash, and after 20 minutes, Rufus crashed. And now my USB is not detectable by windows 10, or any other device I put it in. I have tried looking at the device manager, but it doesn't show there even with an un-allocated drive letter. I have tried disk manager, DISKPART, and partition magic to try recover my USB with no luck, none of them read the USB.
From what you are describing it was the failed USB that made RUFUS crash. Not vice-versa. RUFUS and similar tools cannot physically damage USB. At the very worst they could wipe it clear, and possible even remove the partition table.
If device is not detected by Windows device manager and disk manager and is also not detected by other OS and on other machines you can be pretty sure USB is dead.
Unfortunately now you have a damaged (useless) USB in your hands. Give it up and purchase another one - you will save yoruself some time. Also consider purchasing a USB of widely known vendor at a decent price to avoid disappointments in future. Cheap unbranded USB drives from ebay fail way too often to put any trust in them.