The special weapon is indeed very useful. After hitting the fierce beast hard to knock it out, it comes with a stunning special effect—layers of golden light swirling around it, with a countdown shown in a golden thumbnail above the vision. As long as the "stun" lasts, there's no worry about it waking up.
If it's not finished by then, just muster all your strength to hit it again.
[Fierce beast Yan Xuan's life hair +1]
[Task 5: Cut the life hair from the root of fierce beast Yan Xuan's tail, completed. Reward: Agricultural Acceleration Card +1 issued]
[Task 6: Use a jar of Eight Treasures Spiritual Wine to get fierce beast Yan Xuan drunk and make it drop its guard. Reward: Brewing Gift Package +1]
No wonder this task is only triggered when the courtyard reaches level seven!
