Druids are powerful characters that may make use of their Shapeshifting abilities to destroy their enemies with powerful attacks.
This however causes them to attack at melee range, which can get you in the middle of a group of enemies that can attack you all at once.
The Vigorous Aspect can help with this since it provides you with damage reduction when you are in your Werewolf form.
Vigorous Aspect Effects (Damage Reduction Aspect)
The Vigorous Aspect takes effect whenever you have Shapeshifted into a Werewolf, which happens when you use certain skills.
This causes you to gain a percentage of Damage Reduction that can help you survive against several enemies while you are a Werewolf.
The amount of Damage Reduction provided by the Vigorous Aspect will no longer be in effect if you are changed back to your human form.
Vigorous Aspect Location
You can unlock the Vigorous Aspect by completing the Steadfast Barracks Dungeon, which can be found in the Ruins of Rakhat Keep. (Hawezar)