You touch a point and infuse an area around it with Osteomancy. The area can have a radius up to 120 feet, and the spell fails if the radius incudes an area already under the effect a boneyard or hallow spell. The affected area is subject to the following effects.
First, you know the exact location and hear the thoughts (if any) of any undead creature within the area, and you know as if they are under someone's control
Second, all creatures within the area lose resistance and immunity to necrotic and piercing damage.
Third, whenever a non-undead creature dies within the area, you can choose to have its skeleton ripped from its flesh and rise again under your control. If you do, the creature is resurrected with 1 hit point, it's creature type becomes undead and it becomes immune to all damage until the end of its next turn. On its next turn, you may control it, give it any commands and have it use any of the abilities it had during its life, except for legendary actions if it had any. At the end of it's turn, it dies and cannot be resurrected by any means short of a wish spell.
* - (enchanted bones, incense and herbs worth at least 1000 gold, which the spell will consume.)
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