Drow society is broken down into houses, each with its own family. There are several royal houses which represent the political and religious power of the drow. Each house is headed by a matron, who controls and leads the interests of her family. At the bottom are the slaves, which are owned by a house and have no rights other than what it gives to them. However, drow society is a ruthless climb to the top, and treachery is expected, even from family members.
Their is a former of magic that allows one to cheat death, called reincarnation magic. After a person dies, their soul jumps into a magical item called a soul stone. The soul is then transported and absorbed into the host body, giving the person possession over it. The result is that the body now contains two souls within it that continue to remain separate, with the original soul remaining trapped and the dominant soul of the witch retaining control. The witch now has access to the person's memories, knowledge and spells to use. They can also access the person's mana for an extra boost in spellcasting if needed.
For reincarnation to work, a number of requirements must be met:
The spell requires the victim to be living, so these hosts are placed in a coma-like sleep and kept in magical stasis to prevent them from aging. They are stored in this way until needed for further use.
Mana resides in the soul, and its amount is determined at birth. For reincarnation to work, the potential host must have an equal amount, more or less, to that of the witch. In essence, individuals both weak and strong should only reincarnate themselves into others of their caliber. If the host's soul has more, it will overpower that of the stored soul, trapping them in the host body forever. However, if the stored soul has more mana, it will leak out of the body, burning and destroying it from the inside, killing both individuals.
The spell requires a long ritual involving some rare and expensive ingredients. A blood offering is also necessary, with another individual being killed in the process as a sacrifice.
Clearly the reincarnation spell is extensive, as well as costly. It is also likely that the individual's family members, hungry and ambitious, would covet their position and power, and would not want this person resurrected. They would either forbid it from taking place, or take steps to prevent it from happening through sinister means. even worse, some may even attempt to capture her soul for their own ends, such as ingredients to power a spell, or to torture for information.
A witch needs to safegaurd her soul from her enemies and also ensure that it gets resurrected under these conditions, how can this be made possible?