Raven Tower; Spoilers ~25% or maybe more?; Spoilers to other books;
Isn't magic very similar to Eragon (and rooted deeply in the Earthsea)?
There are nice twists containing promises (also in Eragon); However what took 1k pages in Eragon here was much more condensed (in a good way!);
The difference is that "Life Energy" from Eragon could be taken by force, while here it needs to be given willingly (which kills idea of self-sustaining death spells that were natural extension of Eragon magic)
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