The Stray Demon awards one guaranteed normal Titanite Slab, making this a dependable finite upgrade-material objective.
PC / Global, Remastered edition including Artorias of the Abyss
WHERE & HOW TO FARM
Where to farm
Undead Asylum, in the arena beneath the collapsed floor in the starting courtyard.
Defeating the Stray Demon on the return visit to the Undead Asylum awards a normal Titanite Slab. This is a one-time reward in each game cycle, not a respawning farm. The slab is valuable for taking an eligible normal weapon from +14 to +15, so decide which weapon will benefit before using it. The boss arena is reached through the broken floor in the starting courtyard, and the fight is optional relative to the main route but can be demanding.