UMD Bug?

[Marewood]

I noticed that I failed a lot of scroll casts recently.

Taking a closer look I noticed that the UMD check uses 2xcaster level (currently 14), allthough my UMD skill is 36.

Am I missing something really obvious here, or shouldn't the numbers get applied that are higher (either UMD skill or 2xcaster level)?

Even more weird is that the "bug" only happens when having entered an instance recently. After 5-10 mins the proper (higher) of the two values gets applied.

Did any1 else notice that as of recently?

[Mercureal]

Are you by chance playing an Artificer? I've noticed that the actual UMD percentage chance for scrolls on an Artificer seems to be a few points below what is displayed.

[Marewood]

Are you by chance playing an Artificer? I've noticed that the actual UMD percentage chance for scrolls on an Artificer seems to be a few points below what is displayed.

I'm playing a Wizard EK / Barb Split, currently 7/8. Problem is: my base value that gets applied is not slightly below what should be there but its 14 (2xcaster) insted of 36 (umd skill). I am also not raging or the like...

[Justicesfury]

I noticed that I failed a lot of scroll casts recently.

Taking a closer look I noticed that the UMD check uses 2xcaster level (currently 14), allthough my UMD skill is 36.

Am I missing something really obvious here, or shouldn't the numbers get applied that are higher (either UMD skill or 2xcaster level)?

Even more weird is that the "bug" only happens when having entered an instance recently. After 5-10 mins the proper (higher) of the two values gets applied.

Did any1 else notice that as of recently?

I just figured before I opened if you were wondering why it takes up 3 tries consistently to make a umd roll even when you have 90% chance to make it.

[Seph1roth5]

Are you using a shield/armor/wf body with arcane spell failure? Even if you have enough UMD it can still mess up.

[acemonkey]

Are you by chance playing an Artificer? I've noticed that the actual UMD percentage chance for scrolls on an Artificer seems to be a few points below what is displayed.

The scroll bonus to umd is deceptive.

https://ddowiki.com/page/Artificer_Knowledge
Minor bug: Currently Artificer Knowledge's UMD check bonus works, but doesn't display correctly, which is deceptive. In game, the "Chance to Activate" on the item description reads higher than is correct. The chance to activate does actually increase as it's supposed to, but if the description says "100%", there is in fact a 10% chance to you will fail to activate. What actually happens is the UMD requirement is lowered by 2. The feat then erroneously counts the knowledge feat for UMD bonus (creating a false bonus of 4) that shows up on the tooltip but doesn't actually happen when using the item. The best thing to do is keep track of your UMD and measure it against the item's stated UMD requirement

[Marewood]

Are you using a shield/armor/wf body with arcane spell failure? Even if you have enough UMD it can still mess up.

I tested this stark naked. Same outcome.

I tried to upload a screenshot but upload wasnt working. Just to clarify this again - this is not an arty build - no splash - no nothing.

And the problem is not the UMD roll - the problem is - there is no UMD roll. Instead the game makes a caster level check (which shouldnt happen iirc, cause my UMD is way higher than 2xmy caster level).


One more thing i noticed: This happens only with arcane scrolls (i got 7 levels of wizard). When using divine scrolls the proper value gets applied to the roll (namely UMD).

[acemonkey]

From the wiki on scroll use:
2. The spell appears on the character's spell list at a higher level than he can currently cast, and his overall character level meets the scroll's minimum level.

This requires a check and may not succeed. The game rolls 1d20 and adds 2x the character's caster level. If the total is at greater than or equal to 2x the level at which he could cast the spell himself, the attempt to use the scroll succeeds. This gives a 95% chance of success if the character is one level short, 85% for two levels, 75% for three, and so on. The scroll is destroyed whether the attempt is successful or not.
3. The character has a sufficiently high Use Magic Device skill.

This method also requires a skill check and may not succeed. The game rolls 1d20 and adds the character's UMD skill. If the total is greater than or equal to the scroll's UMD DC (18 plus 2x the caster level of the item), the attempt to use the scroll succeeds. The scroll is destroyed whether the attempt is successful or not.
If the character meets both the last two cases, the game makes only one check using the method most likely to succeed.


Looks like they broke that last bit, and don’t use the method most likely to succeed anymore, at least in your case.

[Marewood]

Looks like they broke that last bit, and don’t use the method most likely to succeed anymore, at least in your case.

That's what it looks like. Thanks for your input.

Guess I'll submit a bug report then.