Elder Guardian Eye in action

It detects any entity in front of it, even items! Right click to turn it off.

Prismarine Coral Showers

Sorry about the darkness, its so you can see the particles :)

Guardian Spines

Ouch!

Corals

All the new corals the mod adds, dead variants aren't pictured

Coral Reef

With the new corals!

Pickerelweed

With several varieties of pike swimming amongst it

Bedrolls in 17 colors!

Nautiluses

In a vent lit up with jelly torches!

Conduit

Now you have limitless border designs!

I sea rocket

(sorry)

Thrasher Firing Sonar

The thrasher fires sonar waves at possible targets to find its prey.