Grave of the Forgotten

There is a single grave with a roiling blue flame...

A prideful warrior died in battle but its soul is restless. It wants to keep fighting, you feel it begging to journey with you.

But perhaps it's better for it to face the truth?

Choices

Locked
You have no cards with Exhaust that can be Enchanted.
Confront with Truth
Add Decay to your Deck. Enchant a card that Exhausts with Soul's Power.
Accept the Forgotten Soul
Obtain Forgotten Soul.