>>74743
You may want to check out the Hindu tantric Aghori sect. They are known for their extreme, tamasic rituals and as powerful necromancers.
They worship such entities as Smashan Tara, Smashan Kali (Tara and Kali of charnel grounds), Mahakala etc.
Keep in mind that "worship", especially in the occult sense of Tantra is different than in other systems, it is closer to being an invocation/evocation, but also not quite.
Just a heads up: if you want to really learn Aghora-related necromancy then some knowledge of Tantra is required, with Tantra being the system of magic those people use. Just wanted to make things clear, as due to new age disinfo most people, even those well acquainted with the occult, view Tantra as some exotic "sex magic" while it is a complex magical system (or rather a multitude of systems sharing the same name) in itself.
There isn't much about them on the Internet, as most Aghoris live in seclusion apart from civilization and they certainly do not write books on the subject, but perhaps I haven't looked with enough dedication.
There is a series of books called Aghori by Robert Svoboda, explaining some of the doctrine by Svoboda's guru Vimalananda but I don't know if they are a good representation of Aghora as a whole.