The 1st Throne - The Kamael: Hellbound has been uploaded to the Lineage II test servers and is ready for player testing according to this announcement at the official site:

The 1st Throne - The Kamael: Hellbound update is now live on the Public Test Server! Be one of the first to try out the new level 80+ skills, new quests, the improved pet system, the Underground Coliseum, new Hellbound challenges and much more!

Check the official Public Test Server forum for more info on The 1st Throne - The Kamael: Hellbound update Public Test Server!

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