Eternal Elixir Feat 16
Source Pathfinder Core Rulebook
Prerequisites Extend Elixir
Your body readily accepts and retains minor changes. When you drink one of your alchemical items that has the elixir and infused traits and a duration of 1 minute or more, you can make the elixir's duration indefinite. You can do so only if the elixir's level is half your level or lower. If you later consume a different elixir and make it indefinite, the effect of the previous indefinite elixir ends.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AlchemistThis indicates abilities from the alchemist class.