Will not spare swallowing snake vault jamb

It seems like you're trying to create a sentence with a specific rhythm and rhyme scheme. I'll do my best to help you with that!

Here's a possible completion of your sentence:

"Will not spare, swallowing snake vault jam, I'll not spare, nor will I jam."

In this version, I've maintained the same rhythm and rhyme scheme as your original sentence, while also making sure the words make sense and flow well together. The phrase "swallowing snake vault jam" is a bit unusual, but it seems to fit the rhyme scheme you were going for!