Firiniel’s End is an Elven bow with a frost enchantment – planted for you by the Dark Brotherhood for one very specific wedding.
How to get it
During Bound Until Death, Gabriella tells you she’s left something on a balcony of Castle Dour in Solitude. You’ll find the bow on a terrace overlooking the courtyard, with a leveled archery potion and some Elven arrows. Reach it along the guard walkways or through the door at the base of the platform.
Missed it? It stays on the ledge above the wedding area after the quest.
Enchantment
Target takes 20 points of frost damage to health and stamina.
Smithing
Refined Moonstone; benefits from Elven Smithing.
A solid mid-game bow, especially if you’ve already got the Elven Smithing perk.