Whoever it was who said they thought direwolves were…
Whoever it was who said they thought direwolves were bigger than normal because of a radioactive material in the obelisks: your theory is disproved, the direwolves size comes from deliberate genetic manipulation, the glow of the obelisks comes from Tek, a refined form of a futuristic material known as element, although in an unstable form element is highly dangerous, it is not radioactive,