Hardy Constitution

is a tier 2 boon from the Storm King's Thunder Campaign.

The alternate boon choice is Survival Instincts.

You need 6,000, 34 and 25 to acquire this boon.

Additional Notes
Excluding the voninblod requirement and considering you unlock Lonelywood first, you would need to do all the Daily quests available to you inside Bryn Shander and Lonelywood for 9 days to be able to afford this boon.