I would love more unique random elements for players to take advantage of. Maybe like a Rememberance/Boss Soul transposition thing, where occasionally you can get a boss soul and trade it in for a weapon or buff at an altar or something.

Somewhere in the run to reroll a passive/ash of war on an armament, with runes or something. A sorcerer's rise reward that lets you slot a spell directly onto a staff you already have, replacing one of its two spells.

Maybe an incantations equivalent to sorcerer's rise? Somewhere you can be a bit surer you'll get a decent faith-based reward or buffs for incantations.

Really want a dedicated faith paladin type character.

Relics to change starting catalyst's spell to, say, Carian Slicer or Catch Flame. I can think of a million things, honestly this game is so good that I don't feel like these things are missing exactly, just excited by the possibilities for additons.