"After reading the chapter I’m not entirely sure, if the permanent loss could be avoided by using other sources instead of somebody’s own Magic Points."
It looks like, from what I've now seen of it - I've had a good long look, enough to convince me to go and get a copy for myself tonight. It looks like the sorcerer can Tap someone's characteristics, including his own, for the requisite Magic Points. Then he can cast Restoration to bring the Tapped characteristic back. And it doesn't have to be POW or INT. He could choose to sacrifice some of his STR, or perhaps his SIZ or CHA.
I have one dumb question to ask, though. Sorcery Spell Enchantments. What percentage of Sorcery (Grimoire) is their effective rating?
A lot of sorcery spells only work if the mage's Sorcery (grimoire) rating can match or exceed a certain characteristic, e.g. 3 SIZ per 10% of Sorcery (Grimoire) skill. If a SIZ 13 character cast Abjure (Cold), he would need 41%+ to begin to affect him. But if the caster had Sorcery (Girmoire) 42, and he enchanted a ring, would that mean that the ring could only affect objects and people of SIZ 1 - 15?
I only ask that, because it seems to me that he could enchant, say, two rings for enchantments: one to Tap, and the other to cast Restoration. "Sit back and relax. This won't hurt a bit ..."