The Heart of the Mountain is one of the two enhanced PvE blessings available in Tibia and was implemented on April 25, 2017. See Blessings for prices and death penalty reduce data.
To obtain the Heart of the Mountain, you must ask Buddel for a passage to Raider Camp. Then visit Nomad south of Bittermor on Hrodmir by using Levitate here.
This blessing can also be obtained by using a Heart of the Mountain (Item).