Archive Tower

Archive Tower Cell Keys

Crystal set - Go out the other door near the bonfire and drop down two ledges

Bountiful Sunlight

Soothing Sunlight

Thrall shows up regardless even if you skip the 2nd and 3rd fight

Capricious Thrall - Chthonic Spark + Dried Chaos Mote + 30,000 souls

Lost Cell Key

Black Leather set - Second cell from the bottom with the sunlight maggots

Soul of a Doomed Thief + Moonlight Arrow 15 - Drop down from the wooden planks to the side of the entrance door

Confirmed Drops

Sunlight Maggot - Sunlight Medal

Man-Serpent - Bloody Greatsword