The plains and jungle both have celestial platforms that do way more than just flipping between day and night, really worth checking out. Once you grab the green scepter during the story, most altars start working but their real value shows up later, when you can properly explore everything. Switching to nighttime around the plains opens up these frozen paths, perfect for finding new chests and optional fights, while daytime might reveal those tricky odin's ravens you've been missing.

During creatures of prophecy, you'll need these altars to call sköll which breaks those annoying magical barriers, and honestly thats just the start. Some legendary chests only pop up at specific times of day, and certain draugr holes won't appear unless you've got the timing right. The norse designs on these things are pretty impressive too, making each time change feel properly dramatic.

Good to know that specific collectibles like yggdrasil dew only show up under certain lighting conditions, so might be worth checking both day and night if you're hunting for everything. Once you've finished the main story and got all your gear, definitely worth heading back to earlier areas cause these altars unlock tons of stuff you couldn't reach before.