This mod contains many Bloodborne enemy weapons and armor pieces, such as the weapons of the Merciless Watchers, Tomb Guardians, and Church Doctors. This includes a short lance and shield wielded by an unused version of the Mergo's Attendants.

Each item is set up to replace another specific item, though you may change the ID of an item to one of your choice, provided you know the ID of the item you'd like to replace.

List of Part IDs

--Chalice Dungeon--
Merciless Saw - Butcher Knife
Merciless Hammer - Spiked Mace
Gravedigger Pick - Pickaxe
Gravedigger Hook - Man Serpent Hatchet
Tomb Greatsword - Excecutioner Greatsword
Tomb Crossbow - Heavy Crossbow
Tomb Arms - Valorheart
--Tomb Sword - Lothric Knight Sword
--Tomb Shield - Lothric Knight Shield
Pthumerian Staff - Izalith Staff
Pthumerian Shotels - Sellsword Twinblades
Madman's Sickles - Winged Knight Twinaxes
Chalice Axes - Winged Knight Twinaxes
Chalice Cleaver - Thrall Axe
Chalice Kris - Corvian Greatknife
Chalice Pole - Halberd

--Nightmare--
Attendant Arms - Valorheart
--Attendant Spiral Lance - Anri Sword
--Attendant Shield - Crest Shield
Attendant Crossbow - Light Crossbow
Chief's Axe - Great Machete
Wet Nurse Twinblades - Warden Twinblades
Mad Shotel - Shotel
Beckoner's Dagger - Handmaid's Dagger
Beckoner's Chime - Crystal Chime

--Church/Other--
Mob Sabre - Follower Sabre
Servant's Rapier - Ricard's Rapier
Willem's Staff - Archdeacon Staff
Church Greataxe - Greataxe
Executioner Halberd - Winged Knight Halberd
Church Scythe - Great Scythe
Church Sword Cane - Shortsword
Bell Axe - Earth Seeker

--Armor--
Attendant Pointed Helm - Fire Witch Head
Attendant Helm - Creighton Mask
Attendant Armor - Sleeved - Outrider
Attendant Armor - Mirrah Chain
Willem's Cap - Archdeacon Crown
Beak Mask - Sage's Big Hat
Snail Helmet - Two Variants
--Back - Standard Helm
--Forward - Eastern Helm

--Monster Heads--
Vacuous Mask - Faraam Helmet
Amygdala Head - Two Variants
--Eyes - Symbol of Avarice
--No Eyes - Gundyr's Helmet

Disclaimer
As these are model swaps, you should not be banned from online play. However, there is still a possibility as you are modifying game files. Use at your own risk.
Additionally, you may have larger or smaller hitboxes depending on the weapon chosen. This can give an unfair (dis)advantage in PvP.
If you are using Mod Engine, then you will be banned if you go online.

Credits
MaxTheMiracle for Parts ID List
ForsakenSilver for FLVER Editor
TKGP for Yabber
Id-Daemon for Model Converter

Installation
Mod Engine:
Place the partsbnds of your choice into the 'parts' folder* in your designated mod folder
*You may need to create the 'parts' folder

UXM:
1. Unpack and patch the game files
2. Place the mod files into the 'parts' folder and select 'Yes" when asked to replace

Links
Mod Engine: https://www.nexusmods.com/darksouls3/mods/332
UXM: https://www.nexusmods.com/sekiro/mods/26

Don't worry that UXM takes you to the Sekiro nexus, it will still work with Dark Souls 3