To access the second island, you must be level 25, but you can start the access quest much earlier!

If you decide to venture down the path of the Good, you must first kill the demon Balork.

To reach Balork, you will need to explore the underground levels of Lighthaven, which can be accessed through the temple.

Then, you must pass through 4 levels of the underground:

Once in front of Balork, use CTRL+C to strike and kill him!

Then, speak to the Old Hermit located in a forest, accessible after crossing the bandits' cave (also called “thieves' cave”) and say to him daughter

Then go to Windhowl and speak to Mirak Nira, the daughter located on the lawn between the Mayor's house and the WH Temple.
Say old hermit three times, then trust.

Kill 100 goblins (of all kinds) and return to Mirak Nira to say trust again.

Q. Do Goblins killed before the quest count towards the total?
A. No

There are two reminders: after killing 50 and 100 goblins. Your karma increases.

Go to see the Old Hermit and say trust while wearing the dynamism ring given by Mirak Nira.

He will then give you a precision amulet in exchange.
Say Miracle, sorcery and he will talk to you about a mage named Liurn Clar who lives in Windhowl.

Head back to Windhowl and find Liurn Clar at the Mage Tower. Say send, conditions, forms, yes, payment, and once you reach level 25 and have the karma marked as GOOD, say send and he will teleport you to the Silversky Fountain.