you know well of how the body reacts to magic and use it to your advantage. bioarcanists may learn or come from blood magic or necromancy though others are unaffilated with these magics and learn only the discipline of bioarcana.

precise magics

starting at 2nd level ,your spells crit on 19-20.

basic bioarcana

starting at 2nd level, you gain proficiency in your choice of medicine or arcana. in addition, when you roll hit dice you gain temp hp equal to twice the number of hit dice rolled.

weave-merged

at 6th level,as an action you can align your body with the weave for 1 minute whenever you cast a spell of 3rd level or higher you gain a spell with a level equal to the level of spell minus 2.

you can only to this once before taking a long rest afterwhich you can do so again.at starting  at 10th level, you can  do this twice per day before taking a long rest.

arcane regeneration

starting at 10th level whenever you regain spell slots outside of a long rest you regain hit points equal to twice the level of the spells gained as you use magic energies to restore you health.

mastered arcane regeration

starting at 14th level, you have mastered the art of arcane regeneration. when you start your turn with at least 1 hit point you regain 2 hit points.