[Byron, Clock Tower] Locked Door(2)

According the description of the quest Demonic Stone is required...
but u will cant find a "Demonic Stone" in game at all.. wth..

i have been stuck in this quest for few days
then i found out that demonic stone is equal to mana stone .. WTF!
there is a very very goodest mistake in the description..
and than all the quest items can buy from the alchemy in auch.

after giving the item to jeana, a key to clock tower can be obtained.

last, go to clock tower 1f and trun the swither, the questline to clock tower will be completed.