Every Avvar holy site, regardless of clan or deity, has a well-hidden opening in the altar which would be aligned with the rising sun on the Winter Solstice, where the sacred relics of the god or goddess would be enshrined. This would never be removed, even in dire emergency, for fear of angering the gods.
Avvar tales from the Divine Age are filled with warnings about those who mistreat or showed the least disrespect to altars of the Lady of the Skies. Unfortunately, the superstitious Avvars counted a host of innocuous things as disrespectful, including speaking, coughing, holding objects in your right hand, and possessing anything containing feathers. It is unlikely there is any real danger in approaching the altar.