Elixir of Immortality

The Elixir of Immortality is a concoction that could grant the drinker long lasting or eternal life, depending on the universe it is featured in.

In Peccavi
In Peccavi, the moon goddess Yuzuki had the capacity to brew the elixir, though she refused to share it with anyone, including her followers. Her reason was that the elixir was a mortal desire that would lead to greed and destruction across the realms.