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I recently obtained the Mehrune's Razor dagger. The enchantment is "Hits have a small chance to instantly kill". What are the chances of the effect working?

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I have no data for this, but I think "a chance" is 10% and "a small chance" is 5% or 1%, and a "good chance" is 20% – GmNoob Dec 19 '11 at 10:18
After like 30 hours of playing with this dagger, it did not loose any charges. – ordag Dec 19 '11 at 11:09
@GMNoob certainly no more than 5% chance. I've been using this dagger for a long time and if it was more than 5% chance I'd definitely notice. Ordag, this dagger, even when it procs, seems to lose no charges. – l I Dec 19 '11 at 11:59
According to quotes the prima guide stating it puts the chance at 1%. That piece of information has not been confirmed and is seen as unreliable, though. – bkzland Dec 19 '11 at 17:42
sounds to me like I need to go test this later today! I smell more science ahead – l I Dec 19 '11 at 19:06
up vote 26 down vote accepted

Testing can be awfully bloody sometimes. Just ask Constance Michel:

For Science!

So I went around in god mode with the Mehrune's Razor and tested it on a bunch of NPCs after doing the following:

  1. Disable their AI via tai
  2. Set their health to 5000 via setav health 5000 (so they don't die to regular damage)
  3. Go on a rampage spree in Riften

Here are the # of hits before dying:

  • 15
  • 14
  • 1 (Super unlucky guard)
  • 114 (Super lucky guard)
  • 39
  • 3
  • 36
  • 51
  • 21
  • 46
  • 67
  • 28
  • 66
  • 66
  • 19
  • 70
  • 22
  • 76
  • 34
  • 18
  • 29
  • 36
  • 61
  • 47
    Average: 38.8333333 hits (stdev 26.8, which is quite high...)

This works out to be ~2.57% +/-1.78% margin of error

If anyone wants to provide more sample points, go right ahead. For now, I'm going to conclude that the chance to proc is roughly 2.5%

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One final thing, the dagger will not proc against any essential NPCs – l I Dec 20 '11 at 0:01
+1 for science. – Feral Chimp Dec 20 '11 at 0:49
+1 for serving Lord Dagon. Greet the new day, Brother. – galacticninja Dec 20 '11 at 3:20
No that can't be right. This is my favorite weapon. It always works. – user19403 Feb 4 '12 at 0:17
@user19403 I'm sure it'll work eventually, if you keep stabbing. – David Yell Aug 7 '12 at 12:25

yx. might need to check his math. I get a mean of 40.7917 for the values he quoted, with a standard deviation of 26.8.

This means 955 hits were non-instant while 24 were instant-kill hits.

Combining this with my own data of roughly 849 hits with 31 instant-kills (plus a few more) gives a total of 1955 regular hits & 58 instant-kill hits.

I applied a Bayesian approach and set the prior density to a half-triangle that peaks at zero, since most people assumed it was small. The final result is:

(2.91 +- 0.74)%,

where the +- indicates a 95% probability interval. As a hunch, since game programmers might prefer round numbers, our data together suggests that 3% might be the true proc rate.

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its a possibility, we won't know for sure until the CS comes out. You are right though, average should be 40.7917 instead of 38.8, but 2.5% or 3% both falls within the error margin. – l I Jan 16 '12 at 0:53
You people scare me, like really scare me. – David Yell Aug 7 '12 at 12:26

According to the UESP Mehrunes' Razor article, the chance of the Mehrunes' Razor instant kill effect activating is 2/101 or ~ 1.98%.

Note: This is the actual chance of activating, as this information was extracted from the game's files using the Creation Kit.

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If you feel that the instant kill chance of Mehrunes' Razor is too small, try the mods Mehrunes Razor Higher Kill Chance or Mehrunes Razor -Improved- to increase the chances of the instant kill effect activating. – galacticninja Apr 26 '12 at 5:15
"They've done studies, you know. 60% of the time, it works every time." – David Yell Aug 7 '12 at 12:27

protected by Adam Lear Aug 7 '12 at 6:26

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