It would be a really nice touch if you added bestiary, it could show monster stats, a picture(bonus if moving), and a bit of lore about them, coming from D&D the lore part is, probably, mostly there, ive always loved reading these in rpgs, smth like this wiki
http://mightandmagic.wikia.com/wiki/Shadow_dragon_%28H5%29
the bestiary should be connected to game and taking stats directly from game(so it doesnt need to be manually updated if something changes in game), so it would be in gateway and/or in game.
for monsters, like dungeon bosses, that have few versions it could show stats for each version, for things that have too many versions it would show min and max values, or value for min and max level
to make it more interesting it could be made that you need to fight the monster to get his stats, for unique quest monsters(like lair bosses from quests that arent repeatable) it should show everything on first time, but smth like dungeon bosses would reveal some stats the first time, but to get additional stats you would need to kill it more times, thus making a complete bestiary an achievement to hunt
the bestiary should be account wide, so ppl can complete it on alt if their main has already done certain quests, and could be based on collection window, but instead of item/artifact/companion list it would have tabs npcs by type - demons, dragons etc. and from there you could select detailed view.
also, while youre at it you could rework lore book, its really hard to use
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they could always sell bestiary completion kit, and i think ppl would actually buy it if it was a quality work, with well written lore(shouldnt be a problem with this being D&D based and all), and was accessible from a mobile device