Similar to the Pilgrimage of the Seven Graces, TR has currently six pilgrimages, with plenty of room to expand from there. Pilgrimages are primarily used both in vanilla MW and in TR to give players an excuse to wander through beautifully crafted exteriors they otherwise wouldn't have a reason to. While this is an admirable goal in itself, it also helps if the trials are a bit more involved than "bring x to shrine get buff quest complete".
In-game lorebook written by an Imperial about the Malahk Orcs and their strange ways, will incorporate some of the lore written by Roerich and me about the Malahk Orcs in the asset browser.