Terroir shrines

A terroir shrine adds one permanent mutation to a spell in its family. Bring a wheel that casts that spell with you, choose it from the shrine's list, then choose the mutation. It can be in your pack without being on your spell belt. A wheel left in storage will not appear just because you have cast it before.

You can leave without choosing and return later. Confirming a mutation spends that shrine, but the same spell can take a different mutation at another suitable shrine. The choices only include mutations the spell can use and does not already have.

Shrine mutations work alongside mastery upgrades and Affinage Arts. The spell first receives its mastery upgrades, then its shrine mutations, then the changes from your Arts. Summon and wall spells are excluded from shrine choices.