This bow combines the very fast speed of Auriel’s or Zephyr bows
with the base damage of Dragonbone bow.
It also has an overwhelming critical damage to hit powerful targets
(10% chance to deal critical damage when you unlock it).
It is not easy to obtain such a piece of weaponry. You should go to
Robber’s Gorge which is south of Solitude, conduct a sweep-and-destroy
operation there, then find the cabin of their boss. There’s an Adept level hatch on
the floor. (Or use the key that is on the table). You open it and get into a cave. Nearby is a boat.
Dive into the water just under the boat, the bow is right there.
The trick of this bow is critical damage. If you are at level 30 in Archery, you can get a 10% critical hit chance perk. And more at higher levels. This bow has a very powerful critical damage, much higher than any other bow.
It is around 200 while its base damage is 20 as for the Dragonbone. But the health of a Mammoth is around 900.
So it’s not overpowered, and it keeps the game intense and unpredictable.
Update. Changed the relevant place names to English, should work fine now.