Starting point of your adventure in another world and home of the Sanctuary Guardian
When you arrive, after being pulled into the dark portal by the monster hand, you'll appear right next to a bonfire. Depending on your level, you may want to kindle this bonfire immediately, as a boss fight is ahead of you. You may also warp to and from this bonfire, if you need to do stuff elsewhere. Ahead of the bonfire is a short, linear path without enemies leading to a fog gate. Beyond this gate is the Sanctuary Guardian.
After you defeat the guardian, behind it is an entrance to Oolacile Sanctuary, and the real start of your journey
Note: After having rested, there will be two weaker guardians here, and both will respawn. It is not advised to take both on at the same time, but one can be killed with a bow from the tunnel to the start of the area. These guardians can also loot guardian's tail.