Wizardry - Proving Grounds of the Mad Overlord

Increase hit points with the petrified demon statue:
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Trade away everything you have at the Inn 
and only equip the petrified demon statue. 
Equip and invoke the power of the statue, 
and your maximum hit points increase anywhere 
from one to five hit points each time. It does 
take a toll, however, as your vitality level 
decreases by one it is used until your levels 
reaches three. It will stop at this point. 
Having a spell caster with an Ihalon spell to 
increase your vitality is a must, otherwise 
the next time you nap to increase your level, 
your vitality may drop to two, causing your 
player to expire and be permanently removed 
from the game. This method is tedious, but 
definitely worth the time.