all item discovery boosting items?

[Axafekt]

anyone know what they are?

[Hobo Misanthropus]

Symbol of Avarice from the Mimics. If you started the game with Rusted Gold Coins, I highly suggest you save them for Mimics to try and get this, as Mimics don't respawn. It is possible to get the Symbol of Avaraice as early as High Wall of Lothric, which I managed on my new Item Farm character.

And some Soul-Transposed Rapier, I think from Crystal Sage? Those are the big ones. If you want to item Farm with Symbol of Averaice, I recommend what I call a "Mr. Bean" build, LUCK and FAITH, spam Bountiful Sunlight. You'll probably be stuck with using Raw Infused Weapons until you get the coal and gem to make Hollow weapons.

[Axafekt]

cool thanks

[Maechen]

Symbol of Avarice is a big one. Don't kill one - use the Lloyd's Talisman on them and put them to sleep. you can keep trying as much as you want. I got it on my 8th go (undead hunter's Charm) As far as I know, killing them all doesn't guarantee it drops so the undead hunter charm method is much better. Can use 5 (carry limit) before resting at a bonfire to auto refill.

Covetous Gold Serpent Ring (+2 version is better obviously)

2x Crystal Sage Rapiers.

Consumables (the coins)

Respec to luck for farming if you can - higher the better.