After unlocking the Spirit Calling Bell from Ranni the Witch, you will have the ability to summon Spirits to fight alongside you as allies. Calling Spirits requires Spirit Ashes, which can be found around the map. Once you have a Spirit Ash, you can equip it in your inventory and summon Spirits in areas where it is allowed.
Most Spirit Summons cost FP, so it is important to keep track of how much the summoning costs and how much you may need for a fight. If you would like to be able to summon powerful Spirits, you may want to invest in some upgrades to the Mind attribute.
You can only use one Spirit Ash at a time, so it is important to plan ahead. Experiment with different Spirits to see what kind of attacks they do, how much health they have, and even their movement tendencies. A good summoning choice can make a huge difference in a big fight.
Here are all the Spirit Summons you can find in Elden Ring:
For more Elden Ring guides, check out How to summon Spirits in Elden Ring? on Pro Game Guides.