Elder Lich Warefare

The other details that caught Ainz’s eye included how 300 Elder Liches were used to carpet bomb a city by synchronizing their [Fireball] spells and how assassins were sent to assassinate the head of a city, whereupon the invasion would commence whilst the city was plunged into chaos.

These records on the methods they had used to destroy the cities were not just useful to educate the Area Guardians, but they were also useful as a study of what strategies an enemy could employ to invade Nazarick.

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Volume 14, Chapter 2.2