Mitrall was a Guardian Deity of the Dead, who would watch over the Dead and their tombs until the time of their return (physical or re-incarnation). The culture that worshiped Mitrall has been conquered and destroyed a few centuries ago. Yet the Cult of Mitrall continues. 

For generation after generation, the cult has continued. They seldom actually worship Mitrall, they just continue his duty of safeguarding the dead. They recruit new members from those who have had their dead abused or desecrated. (Sometimes they recruit scholars of history, who might help them protect the past (and the dead that reflects it)). The Cult watches over graveyards in the citys and tombs in other places. The Cult goes after those who loot graves or tombs of any nature. This means they often go after criminals and adventurers. They will retrieve any stolen good and monies from a tomb, to return it to the appropriate place. If the tomb was desecrated or the violators did not show some decorum, they will often be killed. In addition, the Mitrall Cult will try to free any bound spirit (that was once a person) and any remains of the dead (so they will attack or arrange for others to attack necromancers of the zombie making persussion).  They have taken down a number of Demon Cults which trafficed in bound souls. The Cult of Mitrall is very serious about protecting the Dead so they can re-incarnate or return.

The Cult is quite expert at finding and eliminating their chosen targets.  They will use magics and proper detection work to find them. They have inventories of many tombs. They will either take hand in matters directly, or contract out to other appropriate forces to eliminate the target. In one cunning plan, they had a looting set of adventurers attack a necromancer. They then swooped down and eliminated the battle worn survivor. Some adventurers are actually members of the Cults who are moles, set up to sabotage parties invading parties. They have had centuries to perfect these techniques (after borrowing quite a few from Evil Demon Cults).

Once a great monarchy flourished and the royal Kings and Queens were buried in booby-trapped barrows with treasure and with Undead servants to watch over the tombs. Over time Wights often moved into the barrows and took them over,making them more dangerous still to those who would break in. All the same, there were those who were willing to risk themselves robbing tombs.

Three centuries passed and although some of the tombs had been robbed, more then you might expect remained intact. Things had changed, however. The religion had changed, and the monarchy was also running out of money. The currant King and his Lord Chancellor had what they thought was a great idea. The old tombs were just waiting to be raided by criminals and a few, because of the Wights within them, were a menace to passers by. So they would form an Agency, the Royal Recoverers, to open the tombs and take back the treasure into the Royal Treasury again.

The Recoverers were tattooed to prove their identity on the left arm with the symbol of a broken tomb, and given copper badges in leather wallets as well, to show their legal status, and were paid well to reduce corruption amongst them, and they broke into the barrows. Some died in the process, ensnared in cunning traps, slain by Undead servants or even ripped apart limb from limb by furious Wights, but one by one the tombs had their treasure taken.

They then were given the far less dangerous job of smashing old gravestones and in many cases, digging up the bodies to make room for farmland or urban development. Most of the bodies were burnt on great pyres, but others were thrown into the sea, thrown into a river that flowed through a neighboring country that they were having trouble with, to cause disease in that country, or sold secretly to necromancers for their own foul purposes.

The Mitrall Cult became their most feared and hated enemies and the two groups have had many bitter fights to the death.