I am tempted to post a link to the rs wiki but I -really- do not want to spoil your discovery and delight reading the lore, but the 4 new lore books for the croesus front are the BEST lore this game has ever had.
sana's story, in particular, is amazing!
they are items. discussing them as items. you get them while skilling the 4 gather spots, and I felt like I should testify to y'all that you can get all 4 books from any of the gathering spots. You don't have to mine to get the story of Tagga, but you could get it while fishing.
if/when you have one of the new offhands, or your ring upgraded, its possibly the most lucrative semi-afk pursuit in the game right now too. so make a good plan for gains when... say... its time to watch a show with your lady. you can be passively gathering (with your goe porters toggled on) and get the new, amazing, lore books pretty easy.
good luck y'all!
p.s. we need those items, NOT the ones "smuggled" out in waterfiends (and that will NOT be getting fixed cause its not a bug, but the feature that you need to be able to solo the boss maybe once), to make the new offhands. the unbankable resources, in theory, you could buy to preload your waterfiend for maybe one solo win (its meant to take so long to solo that no sane person would do it too much).
I kinda hope the icons change color to make the difference clearer for us when trying to buy from GE to make stuff, but they'll probably do that soon. repeat: you cannot make the torch with the unbankable timber. don't speculate its going to become a discontinued item. it shouldnt. its an alley oop for soloists so they dont have to play two games to win one.
that might not make any sense unless you make a written plan to solo the boss and tape it to your monitor, but you want resource C to be already in your waterfiend when you start the maybe one solo challenge.
I have quit rsof because moderator found comments about darklight bonus damage on demons "off topic" for wildy flash mobs full of demons