Wish ... Berserk ... Gems ... ???

[Cohen]

Wish ...
I used it but I noticed:
A: Power wishing cannot be double, I wasted a Wish. It would be nice to put an alarm.
B: An item wished appears in the hand of the Caster, not in the laboratory. And if I wish for a cursed item but I need it for someonelse?
C: How's possible to Wish for Power, or Magic Power for someone else? (ie the Prophet). Someone told me it'isn't possible. Why not?

Berserk: It's possible to spellcast in berserk?

(well my pretender wished for Harvest Blade and now I wasted all his magic skills --- about 40 total levels beetween items and his own magic)

Gems: If a 2nd lvl Earth have to cast a 3rd level earth he can spend 1 Earth Gem to cast it.
He can spend 4 Gems to cast a 6th level earth spell?

How do I get rid of a Cursed Item (harvest blade)?

Thanks