Undaunted Unweaver is a light armor set. When you use an ability that costs Stamina, your Light Attacks deal an additional 774 damage and your Heavy Attacks deal an additional 1161 damage for 10 seconds.
A mirror version of this set (Undaunted Infiltrator) drops in Arx Corinium.
The Undaunted Unweaver set is part of the base game. It drops in Blackheart Haven in Bangkorai. Each set item is bound on pickup. You can acquire light armor, weapons and jewelry of this set in the Breton motif style.