Night Maiden's Mist flies somewhat under the radar for most Elden Ring sorcerers.
C Tier Staffs from Tier C are average at best.
For the staff, simply make your way to the south side of the Bridge of Sacrifice and start heading west into the forest.
This absolute monster of a dagger isn't that useful in direct combat, but keeping it equipped as your secondary weapon and pulling it out when backstabbing or riposting after a parry will net you some truly insane crit damage.
It can also interrupt enemies with low poise and stun-lock them into a chain of magical pebbles.
Like the Carian Greatsword, the Piercer transforms the caster's staff into a magical weapon for a quick attack that can be chained.