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Thanks to the Powers of the Demon Eater Job boosting her ability to absorb demonic energy, she was able to do such a feat! She fused this power with her Job's Ability, alongside Mana Disruption and Bloodlust Swarm, generating a spiraling mass of darkness and red energy constantly absorbing and syphoning Lolth's entire soul.
The System as well had the innate ability to absorb souls and convert them into EXP, this was the System's primary function from the very beginning! Using this alongside the other abilities, combined together, Sylph decided to go beyond her own strength, and use this opportunity when Lolth lacked magic power and was in her last stand to eliminate her!
TRUUUUUMMM…!