Ainz - Goblin General's Horn

Momonga had used one once: It had summoned about twelve fairly strong goblins, two goblin archers, a goblin mage, a goblin cleric, two goblin riders with wolves, and a goblin leader.

For an army, it was pretty small, not to mention weak. To Momonga, these items were junk; he was surprised he hadn’t gotten rid of them. This had to be the best use for them.

And yet, there was one good thing about the Goblin General’s Horns. The goblins it summoned didn’t disappear after a set time, but stuck around until they died. They would be able to buy the girls some time.

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Volume 1, Chapter 3.3