'This otherworldly aura… Is it perhaps one of those heroes?'
When Alister had that discovery, his face became solemn.
'If those delusional morons are the ones behind this incident, I will kill all heroes!'
Although Alister wanted to find out more about the mastermind behind this incident, he still prioritized saving the elemental spirits before taking action against the mastermind.
After seeing all of the stacked-up metal cages, Alister activated his Never-Miss Targeting (Red) talent and used his negation superpower.
He targeted the slave collars and the metal cages with his negation superpower. When the effects of the slave collars and metal cages were negated and had lost effect, Alister immediately summoned his Dimensional Mirror star artifact.
Before the mastermind inside the huge fortress could react, Alister stored all of the enslaved elemental spirits inside his mirror dimension.