Marana Karaka Sthana concept is given in Jataka Parijata for the planets Sun to Rahu

Marana Karaka Sthana concept is given in Jataka Parijata for the planets Sun to Rahu whereas
Graha Marana Karaka Sthana bhavas Bhava karaka Pratyadhi Devata

Surya Twelfth Shani Sri Narayana

Chandra Eigth Shani Sri Narayana

Mangal Seventh Shukra Srimati Lakshmi

Budha Forth for Ge, Seventh for Vi Chandra, Shukra Gouri, Lakshmi

Guru Third Mangal Sri Rudra

Shukra Sixth Shani Sri Narayana

Sani First Surya Shiva

Rahu Ninth Guru Shiva

Ketu Forth Chandra Gouri

Judging intensity of Marana karaka sthana:
Karaka of Bhava
If karaka of bhava where marana karaka sthana occurs is placed in trikona to Lagna or Surya then this dosha can be overcomed as Surya gives the neccessary light to the bhava through its karaka.
Diptadi Avastha
If planet is strong like in swakshetra, mooltrikona or uca state then the dosha is overcomed after initial challenges.
Affliction of bhavas lorded by Graha in Marana Karaka Sthana
The bhava lorded by marana karaka sthana graha if additionally afflicted by malefic through yuti or graha drsti is devastated. Otherwise absence of malefic influence on the bhava in question doesnt bode evil, but definitely some issues are sure to expect due to the affliction of the bhavesh through its placement in maranakaraka sthana.