Ainz - Anti-Life Cocoon and Protection from Arrows

“I see. That makes things much easier to explain. I’m a caster.” He cast some spells. “Anti-Life Cocoon. Wall of Protection from Arrows.”

A glowing dome appeared in a ten-foot radius around the girls. There weren’t any other visible effects, but changes could be felt in the air. Normally he would perfect the setup with an anti-magic spell, but he didn’t know what kind of magic this world had, so he just left it. They’d just have to consider themselves unlucky if another caster showed up.

“I used a spell that puts up a barrier that won’t let any living things through, as well as a spell that weakens projectile attacks. If you stay there, you should be pretty safe. And just in case, I’ll give you these, too.” After giving a simple explanation of the magic he had cast, he took out two shabby-looking horns and tossed them over. Apparently the Wall of Protection from Arrows didn’t register them as something to be stopped, so they fell near the girls. “These are items called Goblin General’s Horns. If you blow them, an army of goblins (little monsters) will appear and obey your orders. You should use them to protect yourselves.”

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Volume 1, Chapter 3.3