The new letters authorized the Jews in every city to gather and defend their lives against any force that might attack them on the appointed day (Esther 8:11). The decree also permitted them to destroy attackers and take plunder, matching the original threat with a legal right of defense (Esther 8:11).
Esther 8:11–13 spells out what the king’s new written order allows the Jews to do in response to the earlier threat. Across the empire, Jews in each city may assemble and defend their lives by striking those who attack them, including the attackers’ families, and by taking plunder. The action is set for a single, empire-wide date: the thirteenth day of Adar. These verses sit inside the larger “counter-decree” section that follows Haman’s downfall and Mordecai’s rise (Esther 8). Because the earlier decree to harm the Jews cannot simply be canceled in this story’s royal system, the narrative moves by issuing a second decree that changes what can happen on the appointed day.
These verses describe an imperial authorization: Jews across the empire are permitted to assemble, protect their lives, and use lethal force against people who attack them on a specified day (13 Adar). The text presents this as a public, written policy meant to be widely known, not a private plan or covert action. The stated goal is survival under threat.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Esther 8:11, then read the surrounding section so the answer stays connected to the passage's flow.
11in which the king granted the Jews who were in every city to gather themselves together, and to stand for their life, to destroy, to kill, and to cause to perish, all the power of the people and province that would assault them, [their] little ones and women, and to take the spoil of them for a prey,