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Displayed Magery - I have 105 magery and use the Tome w/+15 magery and I can craft spellbooks with 3 properties which is only available to 120.
Have hard time deciding what the inscription talisman does now that I am GM but prior to reaching gm I could definitly see that I had more success crafting spellbooks with a good talisman than without
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I recently worked up my Scribe, and at 106.7 magery skill, no jewels or other enhancemants, I was able to craft 3 mod spell books. In fact I am still on my way to GM scribe, so I craft spellbooks occasionally and I do get 3 mods here and there.
And as for talismans, the above posters are correct, it helps your % change to actually make the spellbook, but has no effect on the mods (intensity or number of).
As to the question of real skill vs. displayed, I do not know. A couple of years back, I had a Mage with 90 real magery skills and mods up to 120 skill and the spells that were magery based, like mindblast, went off real skill, NOT displayed. I ended up taking him to 120 real skill.