Graah Hally +100 HP Quest Information:
Thanks to Zand Guild Page
Graah hally - 100 HP Quest
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Third HP quest, need a party to do it. Go in Graah Castle, and on top floor, kill Graah for his hally. Sound simple and easy to do :)
Once you did get the hally, go on the first floor, in the middle you will see a well. Climb down, and go east.
Go trade the hally to Duke Moreal.
And again 100 more HP !
Note : You will loose those 100 HP each time you leave Cobrahn, but get them back each time you return to Cobrahn.**
Source: Original mirror