You can share Sanctuaries with your Alliance so that they can visit your creatures, place their own, and help you level up your Sanctuary so you can all earn higher rewards.

To share a Sanctuary, you must be visiting it “locally,” which means via the Map, within the radius of your Radar (the larger blue circle). The distance is checked at the moment you enter the Sanctuary. Once you are close enough, placing any creature in the Sanctuary will share it to your Alliance automatically.

Note that there’s a limit of 100 shared Sanctuaries per Alliance. Past that number, Sanctuaries won’t be shared. Sanctuary shares expire after 24 hours in the list. If your shared Sanctuaries list is full, wait until one of the Sanctuaries expires, and you will be able to share again.