After obtaining You-Know-Who's soul fragment, Allen and Luna went to check on Trevor.
Golden-backed Toads like Trevor were large toads, with swollen poison glands and plump bodies. Now it lay steadily in its nest, its golden back, densely covered in tiny warts, looking rather unsettling under the light. And it was not a toad that liked peace and quiet; Neville often had to go searching all over for it after it wandered off.
Only, when Allen and Luna came in to look at it, it lay motionless on a forest bed covered in fallen leaves. Trevor merely raised its black eyes to look at Luna, its yellow-and-brown striped lower jaw lifting with them. It gave a "croak," as if greeting Luna.
"Igor Karkaroff said the paranoid Alastor Moody once suspected a birthday present he'd received contained a cleverly disguised Basilisk egg, so he smashed it to pieces on the spot without a second thought, only to discover afterward that it was a Travel Alarm Clock..." After observing Trevor up close, Allen realized he had a slight case of trypophobia. "Hagrid also used Fire Crabs and Manticores to breed Blast-Ended Skrewts. These things artificially bred by wizards actually still retain the ability to reproduce..."
"Trevor, once you hatch the baby, you'll be free." Luna bent down and tapped Trevor's big head. She had previously used magic to control Trevor, forcing the travel-and-adventure-loving toad to remain on the forest bed and incubate the egg. "Speaking of which, breeding Basilisks has been considered illegal since the Middle Ages, but it's very easy to hide, because people only need to remove the egg from under the toad before the officials arrive."
"Because it's far too dangerous for ordinary wizards. Just meeting its gaze directly can kill someone, and Basilisk venom is much more potent