It's their trademark spell, so druids definitely get more spellbooks of Divine Wrath. The casting issue is because Divine Wrath is still an arcane spell, while druids are clerical casters (and therefore better at Cure Light Wounds and Light). It's pretty noticeable at orc levels of learning.

The problem is the opposite actually--I get very low castings of the priest spells even at Le 15 and level 12-13. That's what made me wonder if it was a bug, even more than the skewed spellbook distribution.
Druids should learn roughly as priests, right?
Anyway, that character is dead now.

So I tried again, and I think the problem might just be that a couple of spells are misclassified with respect to the druid.

For example, this orc druid managed to get 150 castings of Heal from one reading. Then I read a book of Cure Light Wounds and got only 48 castings. Subsequent readings of CLW gradually inched the number of castings up to 100. Again, this was around level 12-13 with a Learning of 15. Both books were uncursed.

It's hard to be sure, but I think it's worth reviewing the druid spell affinities.

Also, again Lightning Bolt accounts for about half of all spellbooks found. I understand it's a signature spell, but this seems excessive and I don't remember past druids experiencing such an overload.

I hadn't noticed any clerical/arcane mismatches, but it does seem the spellbook weighting is more in favor of the class-specific spells. My most recent necromancer had about 50% Frost Bolt books, I thought it was just a coincidence but it could be a similar change.

Salamander wizard is getting about 50% Fire Bolt spellbooks.

http://www.adom.de/forums/showthread...-Divine-Wrath! - relevant thread, showing others can reproduce this issue too, possibly has something to do with guaranteed spellbook type character starts with.

I can attest to this as well I play druid often and it seems that the majority of the spells I find are Divine Wrath and as for attack spells it is almost but not quite exclusively Divine Wrath. I mean I don't mind having 4600+ uses of divine wrath at level 15 but still, it would be nice to occasionally find other attack spells ;)

One strange thing I noticed with druids that sometime they can not even learn the Divine Wrath they start with. The message they got was like "Can not decipher the book". I dunno if this is a bug.

This is just a literacy/learning fail. Druids start with only mediocre literacy score (~60, typically), so there's a decent chance to fail reading even pretty easy books, especially if your Le is below 20.

Fixed. See http://www.adom.de/forums/project.ph...ge=2#note29573

The last Ultra I did was a druid, I think it was just before R57. 4 books out of five were divine wrath, which I thought was a little too much. All in all it's a really bad class compared to priest, but you pretty much have the Cat Lord ring guaranteed, and it's still a fun to play class.