#using ToS to achieve immortality is a fun plot!

[demonessryu]

There��s a whole Hindu myth about this! I have to google it up to find it. I’m not a Hindu, so if I offend anyone, please let me know. Taken from wikipedia:

[...] Hiraṇyakaśipu, hated Vishnu and wanted revenge. He undertook many years of austere penance to gain special powers. Thereafter, Brahma offered Hiraṇyakaśipu a boon. Hiraṇyakaśipu asked, "Grant me that I not die within any residence or outside any residence, during the daytime or at night, nor on the ground or in the sky. Grant me that my death not be brought about by any weapon, nor by any human being or animal. Grant me that I not meet death from any entity, living or nonliving created by you. Grant me, further, that I not be killed by any demigod or demon or by any great snake from the lower planets." Brahma granted him the boon, and Hiraṇyakaśipu gained these powers.

Hiraṇyakaśipu, once powerful and invincible with the new boon, began to persecute those who were devotees of Vishnu. Hiraṇyakaśipu had a son, Prahlāda, who [...] became a devotee of Vishnu. This angered Hiraṇyakaśipu, who tried to kill the boy—but with each attempt, Prahlāda was protected by Viṣṇu's mystical power. [...]

Hiraṇyakaśipu pointed to a nearby pillar and asked if 'his Viṣṇu' is in it [...] Prahlāda then answered, "He was, He is and He will be." [...]

Hiraṇyakaśipu [...] smashed the pillar with his mace, and [...] Viṣṇu in the form of Narasiṃha appeared from it and moved to attack Hiraṇyakaśipu in defense of Prahlāda. In order to kill Hiraṇyakaśipu and not upset the boon given by Brahma, the form of Narasiṃha was chosen. Hiraṇyakaśipu could not be killed by human, deva or animal. Narasiṃha was none of these, as he is a form of Viṣṇu incarnate as a part-human, part-animal. He came upon Hiraṇyakaśipu at twilight (when it is neither day nor night) on the threshold of a courtyard (neither indoors nor out), and put the demon on his thighs (neither earth nor space). Using his sharp fingernails (neither animate nor inanimate) as weapons, he disemboweled and killed the demon king.

(source)

Narasimha and  Hiraṇyakaśipu

“No weapon forged by mortal hands can slay me!” hits you with a rock