The moment Alex appeared mid-air above the void creatures, he pointed out his left hand down and unleashed a blinding light that overwhelmed the large hall, blinding all the void creatures temporarily.
Naturally, he was also blinded. But before that, Alex made sure to memorize the position of multiple void creatures before going blind.
Additionally, his light-based abilities allowed him to recover from light attacks much faster than other abilities.
The resounding roars and screeches of the void creatures made their annoyance clear to him. Wasting no time, he dashed to his first target and ran through it with his spear, not forgetting to make the creature go boom.
His vision quickly returned before the flash died down. Taking advantage of that, he swiftly moved around and finished off many more void creatures before they realized what happened.
When their vision returned, Alex was nowhere to be seen as he disappeared into another path.