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Basically lore wise, how many Psyker disciplies do we see Lorgar using / being capable of using?

I would tend to believe that Lorgar knows biomancy, divination, pyromancy, telepathy, telekinesis, malefic, santic, technomancy/heretech telepathy, fulmination/ectomancy, and geokinesis/geomortis. So the basics, daemonology (malefic and santic), and the Space Marine/Chaos Space Marine disciplines. That is not to say that he intends to use ALL of them, like santic for example. The Tyranid's Hivemind, Aeldari Rune and Ork Waaagh! discipline is off the table for him. While they may be racial/species specific powers, that doesn't preclude the idea that he can't use something similar.

Though in the 30k rules he's only allowed Divination and Telekinesis (even as Lorgar Transfigured with elevated powers). Perhaps "powerful psyker" doesn't have to mean "has access to absolutely every possible discipline other people in his faction can use."

In one battle I read that Lorgar vapourized entire Astartes sduads with his Psyker powers. That'd probably be use of either pyromancy or fulmination.

I heard it mentioned that at some point Lorgar telekinetically lifted millions of tons of rock. Which HH book is that in?