This is Final labyrinth in Bloodborne and you will need to complete it to get Yharnam Pthumerian Queen Trophy.
Pthumeru Ihyll Layer 1: Pthumerian Descendant; reward: Tempering Damp Blood Gem(6).
Pthumeru Ihyll Layer 2: Bloodletting Beast; reward: Pthumeru Ihyll Root Chalice.
Pthumeru Ihyll Layer 3: Yharnam Pthumerian Queen; reward: Yharnam Stone and Trophy.

Pthumeru Ihyll Pthumerian Descendant.
Pthumeru Ihyll Bloodletting Beast.
Pthumeru Ihyll Yharnam Pthumerian Queen.
Bloodborne Pthumeru Ihyll dungeon.

Bloodborne Dungeon walkthrough. Bloodborne Labyrinth gameplay. Bloodborne tips and tricks. Bloodborne strategy and tutorial. Bone Ash outfit.
Good luck and Have a nice game!

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More Bloodborne Dungeons:
Pthumerian Labyrinth 3 bosses: https://youtu.be/90GijI53F0c
Central Pthumerian Labyrinth: https://youtu.be/lO2JYIpEs3I
Lower Pthumerian Labyrinth Layer 3 Rom: https://youtu.be/rbxnGMSk0Ag
Lower Pthumerian Labyrinth Layer 4: https://youtu.be/PIBjsy5HADg
Ailing Loran all Layers: https://youtu.be/M56BHMD_HOE
Cursed Pthumerian Defilement: https://youtu.be/_0LFNbNOIHw
Lower Loran Chalice Labyrinth: https://youtu.be/-i__TQ_ru08