Zeras eyes narrowed reading the last books as he was caught between which one to choose.
Out of the multitudes of manuals he was able to access, those were the most shockingly effective manuals.
Looking at the manuals, Zeras immediately crossed out some like the Bloody Mana Attraction Manual due to its requirements for blood. Even though the technique was no doubt powerful, its limitations of absorbing Mana from blood and requiring huge amounts of corpse and bloods made Zeras give up the technique.
Where would he get massive amounts of blood from in the EIA? The technique would have been perfect in a war situation. Only then will its true capabilities be unleashed.