At 5th level and every 5 levels thereafter, you boost four different ability scores. You can use these ability boosts to increase your ability scores above 18. Boosting an ability score increases it by 1 if it’s already 18 or above, or by 2 if it starts out below 18.

You learn a special discovery depending on your field.

Bomber: When using advanced alchemy to make bombs during your daily preparations, you can use a batch of reagents to create any three bombs instead of just two of the same bomb.

Chirurgeon: When using advanced alchemy to make elixirs of life during your daily preparations, you can create three elixirs with each batch of reagents instead of two.

Mutagenist: When using advanced alchemy to make mutagens during your daily preparations, you can use a batch of reagents to create any three mutagens instead of just two of the same mutagen.

You’ve trained to more effectively wield the weapons you find in your lab. Your proficiency ranks for simple weapons and alchemical bombs increase to expert.

Your mental defenses are an iron fortress. Your proficiency rank for Will saves increases to expert.

You have learned how to create perpetual alchemical infusions that can provide a near-infinite supply of certain simple items. You gain the ability to create two 1st-level alchemical items using Quick Alchemy without spending a batch of infused reagents. The items you can select depend on your research field and must be in your formula book.

Bomber: Choose two of the following formulas: lesser acid flask, lesser alchemist’s fire, lesser bottled Lightning, lesser liquid ice, lesser tanglefoot bag, lesser thunderstone.

Chirurgeon: Lesser antidote and lesser antiplague.

Mutagenist: Choose two of the following formulas: lesser bestial mutagen, lesser bullheaded mutagen, lesser cognitive mutagen, lesser juggernaut mutagen, lesser quicksilver mutagen, lesser silvertongue mutagen.

Constant practice has increased the effectiveness of your concoctions. Your proficiency rank for your alchemist class DC increases to expert.

You remain alert to threats around you. Your proficiency rank for Perception increases to expert.

You know your formulas so well that you can concoct two items at once. When using the Quick Alchemy action, instead of spending one batch of infused reagents to create a single item, you can spend up to two batches of infused reagents to make up to two alchemical items as described in that action. These items do not have to be the same.

Your body has become accustomed to physical hazards and resistant to pathogens and ailments. Your proficiency rank for Fortitude saves increases to master. When you roll a success on a Fortitude save, you get a critical success instead.

Your perpetual infusions improve, allowing you to use Quick Alchemy to create more powerful items with no cost. The items you can select depend on your research field and must be in your formula book.

Bomber: The moderate versions of the bombs you chose for perpetual infusions.

Chirurgeon: Moderate antidote and antiplague.

Mutagenist: The moderate versions of the mutagens you chose for perpetual infusions.