Siva is a whole bunch of high tech nano bots, scientists are still working on that. The Fallen's shock weapons seam to be electron guns like in CRTs. Sword logic is just a philosophy. read more
Destiny is a sci-fi game, but the lore, some weapons, and enemy mechanics aren't all that realistic in my opinion. If the game was centered around being scientifically accurate, it would be less interesting. read more
Science itself defines destiny many a times and can predict destiny, not one thousand of practical examples are there. And many other simple and traditional believes regarding destiny have been proven by science and many are under debates. read more