I forget about Your request on potion name - well, it was called "POTION" and for sure originates from book 2. Sorry, can't remember where it was found, but its description stated that it restore 6 endurance points.
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Also, in book 5, if you were caught (after giving Malouk worst ride in hise life, through sewers ), and get back your equipment, You end up with having equiped BOTH normal sword (if You took it from dead guard) and sword of sun (the one from book 2).

Also, missed note - since book 3, You're able to have equipped BOTH chainmail and leather pad - they endurance bonus stack up. Is it by design, or bug?
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Side note - I think I'm playing it too much, upon reading Pizza restaurant menu, for half of a second, I was surprised for lack of "Choose pizza a, b, c" buttons...

// edit

in the book 5 herb merchant shop, you may buy Alether - herb that should increase combat skill by 2, for duration of one fight. Hoever, there is no way to use it - either from equipment window, or from pages before battle.

// Edit 2

Before page 275 of 5th book, you need to tell if You were given crystal pedant necklace, or not. Despite having this item (from book one), I can only choose that I don't have it. Which leads to rather quick death, unfortunately (at least, after rolling 9 on dice).

// Edit 3

This book is also affected by lack of "load last saved" position, and "cloned items" bug. Upon re-trying it, I have items from the moment I've died, not from where I started book 5.

The "already won fights" bug is also present - every re-attempted fight is won from the beginning, just like it was with book 4. Oddly enough, even items that I've discarded during 1st attempt, are to be found where I left them, during 2nd attempt on book 5 I suspect it's same for book 4, due to nature of this book.

It's worth to investigate book 3 - I won it on first try, so it's possible that I've missed this bug there.

// edit 4

If, while running on flying mounted bird (book 5), you choose east way, You get attacked by flying warriors. Battle there is totally screwed - it should last only 1 round per description, and then, just like in book 4, You should answer who lost more endurance.

Instead, you fight to the very end, and 3 dialog options (you lost more, less, or equally the same amount) are presented, containing bugged text like <class span smallcaps> etc.

// Edit 5

on page 288 of 5th book, there is again bug with crystal star pedant - despite having it, I can only answer that I don't have such item.