Find a female Wyvern that is carrying an egg
Knock it unconscious
Feed it Narcoberries or Narcotics to keep it asleep
Collect the Wyvern Milk from its inventory
Repeat if needed before it wakes up
Find a female Wyvern that is carrying an egg
Knock it unconscious
Feed it Narcoberries or Narcotics to keep it asleep
Collect the Wyvern Milk from its inventory
Repeat if needed before it wakes up