Hell Spiders were deemed as extinct and didn't harbor a curse but the 'Crimson-death' Hell Spider, as Jason called it, was much stronger with its curse because it distorted the enemy's senses.
This curse could even forcefully erupt anger and wrath within its opponents, preventing them from retaining a calm mind and make them act recklessly.
However, now that the Crimson-death Hell Spider witnessed how some of its offsprings had been killed, the curse's full might had been unleashed.
At least that was how Jason's mana eyes perceived it and he couldn't help but feel that the fight between the Hell Spider and wind affinity songbird was about to become really ugly.
The songbird was already weakened through the distorted senses and confusing emotions erupting within its mind because of the curse earlier.
Now that the curse was fully unleashed, and solely targeting it, the songbird's combat prowess decreased by a large margin within a moment.