

what did I just do to my game?" I considered making the raising of a basilisk prohibitively hard, making the egg break, etc but I think I want to roll with this instead.

My players sometimes read up on a monster after a fight (which I don't really care about, I know some DMs really don't like that), so likely saw the note about this in the monster manual. I of course had not considered this at all. At the end of the fight, players asks "Are there any eggs in the lair?" I think for two seconds and say "sure." They of course decide to take the egg and eventuslly raise it as their pet. My party went basilisk hunting and defeated a basilisk in her lair.
