I DO NOT have a Wormsinger rune, I've ground out the dreadnaught for 3 days and not gotten one. I think if I help kill the ultra I can get a rune, my friend said that's how he got his key, he just helped with an ultra when some random used the cylinder thing that says "requires Wormsinger rune" so, if you have one and want to help me by letting me help you, that would be great. 😜