Ok simple really. Let's take the Elder Tome
and Elder Jewel
The Tome has 720MB and 380MA
The Jewel has 760MB and 340MA
So the tome has 40MA more but 40MB less.
Now you have 4 Manastone slots on both items. So you will want to even out the difference. If you take the Tome you need 40MB - which is easy if you use MB+25 stones. You put one on each manastone slot and you have 100MB more - so now the book has 820MB and 380MA.
If you take the Jewel you need to use MA+12 stones. So you put 4 in each slot and you get 760MB and 388MA.
Tome - 820MB , 380MA
Orb - 760MB , 388MA
The tome wins.
I hope this helps understand it better. So the jewels are only good while leveling up - you have weak monsters and you don't really need MA so much, but you need lots of MB to kill them faster - so you take orbs. After you max out your levels and you are ready to Raid big bosses - you do need more MA in order to hit them. So the book is the way to go!
Last edited by Alendris on Sat Jul 17, 2010 4:08 am; edited 1 time in total