Start by going to Rorina's castle south of Thais, here:
Ask Rorina for a mission.
Go outside the castle and find the secret basement entrance hidden behind a bush here:Follow this path to get to the crystal room:
The line shows the route to Rorina quest line. The other two pictures are the hidden quest in Rorina 1
The Book down at quest room reads;
As you approach the book you see a glimmering object sticking out from one of the pages, and you pick it up (Take the Glimmering Talon from the chest) You think to yourself "This must be what Rorina wanted me to get her."
Report back to Rorina.
For the second part of Rorina quest line you should head over to Darashia
Go thru the left door and down the hole and you end up here
Just follow each path and clear the rooms and pull the levers. You will encounter everything from skeletons, mummys to warlocks and hydras.
The path to the right has a hidden quest inside of it here.
Just walk all the way around the outside down a sewer and you will end up in the hidden quest room. Dont forget to pull the lever before doing that!
Once the stones are gone go down the hole.
You will end up here and just follow the path down the sewer. After that there is an exit portal and another sewer. Just jump down the sewer for the final boss room which contains warlocks, heros, banshees.