How to access Spirit Veins in Nioh 3

Pcgamer writes that almost as soon as you set foot into Nioh 3's first open-world zone, during the Warring States period, you'll stumble across a Spirit Vein. In fact, there are two not far from where you enter the Tenryu River. There are different types of Spirit Veins, and to use them, you need to unlock the corresponding Guardian Spirit by progressing through the main story.

For example, after beating Jakotsu-baba and clearing the Crucible at Hamamatsu Castle, you'll unlock Enko, a fire tiger Guardian Spirit. This unlocks Gale Sprint, but what you're not told is that you can now also channel this Guardian to use wall-running Spirit Veins, which are common in later areas like Lake Sanaru.

You don't need to have the correct Guardian Spirit currently equipped to access the Spirit Vein, either, so don't bother cycling through all your options in the hopes that you'll get it working. You'll know if you can use any given Spirit Vein if the map icon changes from a padlock to a starry icon.