Shadowheart gets 3 free buffs for a day in act 2

there is a hidden sharran sanctuary in act 2, and you can get 3 buffs there. sharran worshiper can get these without any rolls

how to get to sharran sanctuary in act 2

the entrance is hidden, this is the puzzle solution

Shadowheart gets 3 free buffs for a day in act 2

there are 3 statues inside. they can give you a buff if you roll successfully OR if you are a sharran worshiper. so this pretty much means your shadowheart can get 3 buffs for free, they will last till the long rest