Destroying Odin's Ravens is an objective in God of War Ragnarok. The large open Barrens area has two Ravens in it. The guide obviously contains spoilers related to God of War Ragnarok, so continue at your own risk. Once you reach the other side, you will be greeted by a Lore Tablet and a chain allowing you to get back to the Cliffside Ruins. Like with the previous Raven, the area you need is locked until the Creatures of Prophecy questline. You will find the writing as soon as you go down the dragon's lair in the mission "A Trail of the Dead". The Raven will be resting on a large tree which partially covers the cave entrance.
This area cannot be accessed or explored until after the main story quest Forging Destiny so proceed with caution. Odin is the All-Seeing God and as he did back in God of War (2018), he has placed 48 of his Ravens in various places across the Realms. It would throw rocks at you and without the proper ability to get over to it, you simply had to flee. The Derelict Outpost has a total of two Ravens to find. Look towards your left and you'll see the Raven perched on a large rock structure.
Like the last one, you will probably see it as you are riding the boat and be unable to act. The first Alfheim Raven is located in The Strond, the area where Kratos and company first spawn. On the plant platform go to the right of the area, break some crates to get the scroll. Starting at the Celestial Altar, make it daylight and continue along the roots of the tree. Near the lever puzzle (which requires using the Leviathan Axe to freeze certain parts of the gears), there is a hole in the wall where the Raven can be seen. The last slab in the area can be found at the Seidr camp. This is where the Lady waits and Brok asks you to gather some materials.
The easiest place to catch this bird is to go just past the Nornir chest, where an opening in the wall will allow your Axe easy access to the Raven. However, to get to the Raven approach the pile of Dark Elf corpses to find a breakable part of the wall. Fling your axe through the hole and another of Odin's Eyes has been blinded. The notes are located to the left of the starting beach. The last Helheim Raven is back near the Mystic Gateway.
There are a total of 13 Ravens in Svartalfheim. The first Raven can be found as you're approaching the Outpost.