The Sinking City 2 trident is part of a puzzle in the Church area that involves the nearby obelisk. It's not very clear though, and even if you find and read the various notes relating to it, it can be unclear what you're meant to do with any of it.
I've solved it all already and have explained the process fully in my in-depth Sinking City 2 walkthrough covering the flooded city section. However, if you just want the short version, here it is.
Unlike the Sinking City 2 printing press puzzle, which involves several locations, this can actually be solved the first time you find it, as long as you know how.
What to do with the Trident?
You'll find the Trident in the Church behind the Star locked door, once you have the Star key. But it's not clear what you need to do with it.
You'll actually want to take the Trident and place it on the Obelisk to start things off. Once you've done that, you'll want to rotate the Obelisk symbols using the information found on the "Call Upon Believers" note which lists four gods (found on the altar when you first enter the Church), and the First Vision note which lists their symbols (found in the Star locked crypt in the graveyard).
Matching up the gods and symbols gives you the the order you need to arrange Obelisk sections, while the mention of 'from the depth to the heights' in one note means this order is from top to bottom and looks like this:
- Yig: Serpent Form
- Tsog-Nar: Crooked Cross
- Gyrh: Spearhead
- Cthylla: Splayed Womb
Once you have the symbols in the right place, lightning will start hitting the Trident at regular intervals so get clear. Some enemies will also appear, so have fun kiting them into the electricity. A tip will light up each time the Trident is hit, and when all three are lit, nip in and grab it.
Now take the Trident and place it back where you found it. When you leave this small room, you'll be in another dimension and the Church will be full of statues. Go to the altar and take the dagger from the statue right in front of it. Place the dagger into the slot in the altar and you'll be lowered into a basement area for a small boss fight. When that's done, you'll find some Dream Essence upgrade points on the altar as you leave.
You'll be at best about halfway through the flooded city area if you're dealing with this as you find it. However, you might be closer to the end if you're backtracking. Either way, my Sinking City 2 Hospital walkthrough is likely to be useful real soon.
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