From Goblin to God

Lin Jin transmigrated into a Western fantasy world, becoming the weakest goblin in the Black Fang Nest. On the night of the Blood Moon coming-of-age ceremony, he awakened the 'Spirit Contract Dual Cultivation System': by forming a spirit contract with a willing adult, he could absorb their essence, enhancing his physique, spirit, magic, and bloodline potential. Against hostile, resistant, or fearful targets, true dual cultivation was impossible; he could only siphon small amounts of overflowing essence through combat, mental suppression, and magical clashes, with minimal gains and contamination by resentment. A weak goblin, to survive in a world ruled by knights, mages, churches, nobles, and dragon descendants, had to be more cautious, ruthless, and cunning than everyone else. From the nest's coming-of-age ceremony, to ambushing adventurer parties, to establishing an underground kingdom, Lin Jin cultivated both physical and magical paths. Those female priests, half-elf rangers, noble knights, and tower witches who once despised, scorned, and sought to kill him would eventually, through repeated failures, deals, wavering, and acknowledgment, realize: this green-skinned monster is climbing toward the throne. — Description from novelcodex.org