I have a demo level 21 now...and I have a couple questions
-Does the extra spell damage from wisdom work for demo's?
nope, only intelligence
-Fatality, hit and crit rating works but what about combat rating?
only if you hit the mob with your staff (so NO ^^)
-Sometimes I can't use some of my spells...while I have enough mana. Is that why the game is offline atm?
for most spells u need to face the enemy then it should work (and be in range)
-Is there any use for stamina?
nope
-What does the dps of the staff do?
nothing unless u hit the enemy with the staff which i dont advice u to do^^