God anvil is accessible via the /warp god-anvil command.
It serves a number of purposes:
God Repair Potions
The trader God Anvil Overlooker sells one of the many god repair potions.
The rest of the potions available must be collected during Seasonal Events
Upon drinking, each potion adds an additional god repair per week.
Stacking God Repair Potions
You can only drink one of the same kind of potion.
Seasonal potions are given either the ID 1 or 2 based on their year of creation.
A seasonal god repair with an odd-numbered year such as 2019/2021/2023 will be given the ID 1.
A seasonal god repair with an even-numbered year such as 2020/2022/2024 will be given the ID 2.
This allows you to have 2 of each seasonal potion.
Special God Repairs
There are a number of god repairs that aren't obtained by drinking a potion.
Crafting a God Anvil
You can create your own god anvil to place anywhere by surrounding a normal anvil with 8 Star Remnants.
It does not drop an item when broken.