After 8 more dark elves joined the fight against First Elder Zolthar, adding to the previous 28 he was facing, he alone was now facing 36 of them. Thankfully at the opportune moment, he used his darkness ability despite it being very taxing on his old body.
The name of the ability was Gloom Echo, it was an extremely powerful sonic-type attack that used the main component of Darkness to stun the minds of his enemies for a few minutes. And it was very powerful as well.
Moments after he activated the Gloom Echo he hurriedly immobilized 10 of them but right after the rest of them broke free from the stunned state and started attacking him again like nothing happened.