I want knowledge-based improvements in games with RPG elements (experience, crafting, quests, monsters). For instance, having skills that let you study creatures passively, and with enough skill, actively dissect them to learn about them. Study books, study under teachers, learn even more, and gain myriad benefits.
>Due to your understanding of quadruped physiology, you can now obtain higher quality cuts of meat, pelts, organs, bones, and fluids from your kills.
>Due to your innate understanding of humanoid physiology and anatomy, you are more easily able to kill with stealth, striking opponents in such a way that they are rendered unconscious or killed quickly and silently.
>Due to your journeyman understanding of insects and arachnids, and your understanding of compounding, poisons, and medicines, you can now craft arrowheads that will puncture exoskeletons and introduce paralytic compounds into the circulatory systems of spider, ant, scorpion, and other arthropodal creatures.
>Due to your understanding of poisons, medicines, anatomy, and butchery, you may now perform surgery on humanoid beings, and compound antivenoms and antitoxins.
Stuff like that. Gain skill in various fields of knowledge that may or may not overlap, to improve your ability to heal or harm things. It's just more tables of numbers for stats, nothing super complicated, but easily exploitable. Master anatomy and hand to hand combat, and start one-inch-punching enemies in the chest to insta-kill them due to heart trauma.