Nice entry level kata on game development.

it is not wrong, I copy pasted the formula and starting stats from description and it worked like a charm

Please don't post solutions/strong spoilers to katas in Discourse - let other people solve it, you don't achieve anything by telling them what to do.

Just leaving a tip so others don't get angry like I was getting. You'll only learn how to solve this one when you decide to "somehow cheat" because the answer is by no means related to standard calculation. It is a trick.

Man, I'm so sorry but I didn't see your comment until this very day. What is "tlas" though?

Formula in description is wrong, i looked at official docs and it worked (https://darksouls.fandom.com/wiki/Level_Up)

Don't focus too much on the formula (which is 100% correct) - read carefully the description and analyse starting level very carefully.

The issue I've raised was that node v10 does not work properly which is true if the tests fail, but anyway nice that it is fixed

Should be fixed now.

Should be fixed now.

Yeah, test suite needs rework, but the issue you raised at first had nothing to do with it.

For the default test cases it says:
"No output was produced.
Make sure tests are written properly using describe and it (required for Node 10)."

I know I could refactor the testcases, but it should work by default with the given tests.

There is also another Issue by @gpickin which means the same.

Random tests fail every time. The formula you're giving me is obviously not the formula that you're using for them. The souls required are way more than what the standard ones required. I'm using your formula exactly.

What do you mean? AFAIK it works, error messages (which you should carefully read) most likely come from your code giving invalid results.