I finally came up with a god of death that will suit my needs!
Here are my two biggest inspirations.
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The Robe (also The Black Judge, The Master of Dreams)
This deity is the personification of death. It is the most wide spread religion among human lands.
The god of death is most commonly presented as a human figure covered in a black robe, no face visible from under it's hood. Often statues of the Robe can be seen with large, black swords.
It is believed that no living thing can ever see the face of this god, as he IS death. It is often said that a person who passed away "saw the Robe", or "had seen the face of Death".
Similarly, the Black Priests (or the Priests of Death) should wear their robes at all times, never showing their faces, or revealing their true identity to anyone outside of the order. It is said that upon donning the Black Robe the priest "dies" to the world, becoming an anonymous agent of death.
Revealing a priest's true identity to a person from outside of the order is thought to be a sign of a great friendship, but also a burden to the person who knows it, as the priest has the right to claim his or her life, if his name is revealed to anyone else.
According to the dogma of the Order of Death (or the Black Brotherhood), the Robe is also the patron of sleep and dreams, as these are thought to be a preparation before the "final crossing". It is believed that sleep is caused by the god spreading his robe over one's bed.
The cult's priests are know for their ability to speak to the dead and summon dead souls, as well as perform elaborate divinations. On the other hand hey are strictly forbidden to bring the dead back or to create any forms of undead. One of the main commandments of the religion is to destroy any undead or necromancers, as they disturb what the order believes to be the foundation of the world.
Finally, the priests of Robe also holds responsibilities for handling executions, which they address as "assisting in the last crossing". Although each priest is trained in using a black great-sword, in case he is asked to "assist", executions remain a responsibility of the common clergy members and not the high ones. It is important to note that Black Priests are strictly forbidden to perform any tortures or take any slaves/prisoners of war.
The cult is quite numerous, well organized and has a temple in almost every city. Usually the order takes care of the cemetery, very often the temple is situated next to it. Common folk visit the temples for healing, as the Robed Priests are well trained in making healing potions and known to posses great knowledge of human anatomy.
Although in casual talk people refer to the Robe, as a male, members of both sexes are accepted to the clergy. Both wizards and clerics are common in the order.