Mythra gets the ritual book, which contains the level 6 rituals Undead Servitor and Wizard's Escape, plus 920gp worth of additional rituals which you can choose freely. Total market value is 1800gp, equivalent to a level 6 (n+2) item.
Grys has already received his level 4 parcel, and is therefore feeling unaccountably generous when it comes to the division of loot today.
The rest of the loot, to be split between the three remaining members of the party, is as follows:
Magic Items lifted from the necromancer's corpse with a resale value of 1480gp
244gp in miscellaneous gemstones, coins and residuum, found in the necromancer's den
1 Dhaakani Bronze Urn, value 1000gp
Total Worth = 2724gp, split 3 ways will be 908gp each for kal'Tarron, Serris and Orsik once you've had a chance to liquidate (this represents a parcel of gold equal to the price of a level n item for each of you, plus 68gp of your bonus gold for level 4)