Zerth Blade

....Dak'kon's Zerth blade is supposed to let one memorize 4 extra spells of level 1, 2, 3 and 4. Does this mean I can carry around 4 more spells than usual, or does it also allow me to scribe more spells into my spell book as well?
.....As well, I have to carry the weapon in my primary hand, not the off hand. Overriding the weapon with something like Melf's meteors also cancels the extra spells. The description says that I have to rest before being able to cast the extra spells; does this mean that I have to use up all the meteors first, or can I cast the spells after a simple rest, but with some meteors left over? Logically, still having some meteors left over should indeed cancel the spell slots, but I just want to make sure. Sometimes the game mechanics get weird.
.....As well, I have to carry the weapon in my primary hand, not the off hand. Overriding the weapon with something like Melf's meteors also cancels the extra spells. The description says that I have to rest before being able to cast the extra spells; does this mean that I have to use up all the meteors first, or can I cast the spells after a simple rest, but with some meteors left over? Logically, still having some meteors left over should indeed cancel the spell slots, but I just want to make sure. Sometimes the game mechanics get weird.
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Comments
Being a ranged weapon, Melf's Minute Meteors cannot be dual-wielded with a melee weapon like the blade. And if you main-hand the sword, the meteors override it. Either way, you lose the equip bonuses if you cast that spell. Sure, you can put the sword in either hand, but either way those slots go away temporarily, causing you to "forget" any spells over the limit.
Either don't use those two together, or cast some other spells before you cast MMM (or otherwise switch weapons) so the memorized spells you still have available are within the reduced limit.