I remember when Shadowlands was initially released and there was a marked lack of anything related to Shamanism, I did a whole write up about a potential Shaman-themed covenant and what it’d look like.
The basic idea would be that this Covenant would oversee a realm inhabited by ancestral elders/heroes/spirits. The leadership would be a council of figures concealed by unique and elaborate masks and draped in cloaks/furs/hides/whatever. Their whole schtick would be their ability to travel across the Shadowlands and even into the land of the living- so they’d be the Shadowlands’ seers/military advisors/viziers/emissaries. Call them the Forebearers.
Their ability to travel across time and space and allow others to do so would also explain the ability for certain dead to commune with Shamans in the realm of the living.
The key conflict would anima shortages restricting their ability to foresee the future or communicated as capably. Usually, they’d be the ones seeing stuff like the Jailor’s moves coming and provide the other covenants with their sage wisdom, but now they’re blind and squabbling among themselves. Some (more representative of elders and wisemen) are convinced that they just need to wait and see, leading to endless navel gazing and inaction, while others (more akin to warlords and champions) are more for direct action- even if they’re acting blindly.
And yeah, a zone with more varied terrain like tropical jungles/tundra/grasslands/scrublands and architecture like gigantic shrines, stone circles, longhouses, bonfires, wood/stone structures, and lots of Dwarf, Kul-Tiran, Orc, Tauren, Troll stuff.
Also, Cairne could be our character contact, providing a vehicle for Baine to have some relevance/development. Afterall, the BfA Tauren heritage armor quest saw you travel with Cairne into the Shadowlands (via a shamanic ritual) to deal with a rising threat. It was petty much our first official journey into the realm. And of course, Bwonsamdi would play a big role.