SPOILERS AHEAD.

Dragonborn questline. In that moment after Mora asks you to give him the secrets of the Skaal, you can choose one of those three powers.

I picked Dragonborn Frost which gives Frost Breath a similar effect to Ice Form. Later on, I noticed how useless it is, since it only lasts a few seconds.

Then I checked my inventory to read Epistolary Acumen again and it wasn't there. I'd forgotten to loot it back from Storn. When I realized that, his body was already gone.

I thought it was like when you let Erandur read The Dreamstride, in which case you're just lending the book, and it remains in your inventory.

Dragonborn Force would've made so much more sense to choose since it adds some extra punch to Unrelenting Force, which is the LDB's signature Shout, in a way.

I swear, if I hadn't invested several hours into this gameplay, I would be willing to start over just to fix this crap.

Useless? Thats one of my favorite shouts now. Its like 15 seconds right? Thats pretty darn long for freezing a group of people. Frost breath is actually useful now.

I 2nd this as it combines frost breath and ice form which is sweet. If the Force upgrade made the shout have a wider spread and stronger effect (especially on larger creatures) then I'd be all over it.

I'm lucky that you put "Dragonborn Questline" at the front of your post. This is in the wrong section and it contains spoilers galore. Please tag it.

Nobody visits the spoiler section, man. Nobody.

Don't expect a reply from more than one person if you post your thread there.

Perhaps you should read the pinned topics in the General section where it says "DO NOT POST SPOILERS IN THIS BOARD".

I moved it to the correct forum

Have you visited Frea lately? Not the first encounter after completing the DB MQ, but the next day or two she will "give" you back the book when you "speak" to her (she added some interesting comments about it while giving it back to you [don't blame her either]).