Maybe it's a dumb question

I am filling my second set of handbooks, but on the Hero Handbook I can only get 15 out of 16 pages. I am not finding a way to get Destruction's Depths
again to complete hanbook. I've searched a few keywords on the forum but did not manage to get anything. Appreciate your answers.

Go back to Jalis' encampment and talk to the king. Just take the entrance from the transfer chamber. Talking to him will give you the quest.

All quests can also be re-added from the Scrying Pool.

I tried going back to Jalis camp and he gave me nothing. Also scrying pool will not give you Destruction's Depths. Any other suggestions?

Scrying Pool will give you the quest, and Jalis does let you redo this. I did it again today in Hard Mode.

If you already did it, see if you can buy that page for 100g at the book giving npc.