---)Voidborn Invocation: Upon usage, summons an entity from the deepest and most forgotten part of the Void—a being of nothingness that devours all life and energy around it. The creature is unstable and exists temporarily, feeding on everything in its path. It obeys the caster, but its presence harms reality. The level of the summoned creature depends on the caster's level. This skill can be used once every month.
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When Evan had broken through to Rank Three in the Azragoth World, he had received the Voidborn Invocation skill due to the influence of his Ruler's Authority. (Chap—1140)
Even now, his Ruler's Authority—Soul Keeper—wasn't fully unlocked and had only reacted once—when he revived Carla.
Because of the somewhat terrifying description of the Voidborn Invocation skill and the unusual circumstances under which he had acquired it, he had never used it before.