One of the lyrical underreated artists of all is K- Rino
Former known as Ac Chill he started rappring 1984.
If you dont know him check out some tracks. He has thousands themes. Some serious, some funny, political, storytelling.
As example he is battling with a canvas, describe the perspective of a baby, has a track there everthing is talking to him, about depresion, about self esteem. Here just some different tracks to show his lyrical skills. Enjoy!
Here he is using acronyms to explain words.