Birth Undeath

You perform an unholy ritual, sacrificing sentient lives to birth an unholy abomination, a vessel that embodies the consumptive, vacuous nature of true Undeath. 

This spell can only be cast on unhallowed ground. If cast anywhere else, this spell has no effect, and may attract the righteous ire of any holy being that stands for goodness in the world.

Once the spell has been cast, the life energy of the 5 humanoids is drawn into the diamond used in the spell, and their flesh is used to construct your Abomination, an undead construct that is loyal to you. The exact nature, aspects, and game statistics of your Abomination are to be decided between you and your Dungeon Master. Your Abomination can take any form you want it to upon creation, pending approval by your Dungeon Master. 

True to the nature of Undeath, your Abomination desires the consumption of life above all else. As your Abomination kills, consumes, and ages, its power grows and its form evolves. As with its creation, the degree to which it evolves and grows stronger is a matter to be discussed between you and your Dungeon Master.