Hi :
The Dream of Piers (horse) pet and the Eternal Woods (frost) portrait, shown below, are added automatically to your collection when you complete Chapters I to iV.
There is another pet and another portrait, shown below, who are also available this season… when you complete all the objectives of the journey.
The season will end Sunday… you will need to hurry if you want the Angelic Treasure Goblin pet and the Valor Portrait Frame.