Leviathan
Leviathan is associated with the Labyrinth, the Scarlet Church's beliefs and a late-game beam hazard. The small Leviathan statuette near the opening is a separate puzzle object.
What I checked
The IGN Scarlet Church trailer names Leviathan in its description. PowerPyx describes avoiding Leviathan's beam during Hunt Marlowe, while its boss route documents Bruno, Charlotte, the Sister and Marlowe. These sources do not establish a separate Leviathan health-bar fight.
Statuette, beam or boss?
For the opening statuette, follow Escape the Cult: place the detached tip back on the statue and use the interaction to continue.
For the later beam hazard, use Hunt Marlowe and its bridge section. Fighting a conventional boss is a different task; the boss guide separates those encounters.
The ending's use of Leviathan is discussed, with story spoilers, on ending explained.
Questions
How do I beat Leviathan?
I have no guide that frames Leviathan as a standard boss. The ending page is the relevant one.
Keep reading
Sources
- PowerPyx walkthrough — Beam hazard and named fights.
- IGN Scarlet Church trailer — Leviathan in the trailer description.
- Wikipedia — Ending mention.