To get this item to work, you need to collect 10 x Spell Focus Fragment to make a 不稳定的法术焦镜. You can get these from killing any of the humanoid adds in the area.

Once you have the 不稳定的法术焦镜 (and you've taken your 月落骑乘角鹰兽 ride), stand on the purple runes on the ground and use the 惰性水晶 on an 皇家咒法师, till you've used it three times. This will complete the quest, 强力干扰.

小知识

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惰性水晶

物品等级：1
任务物品

使用: 使目标过载，释放出大量的法力。 (8秒冷却)
"一个能够吸收大量能量的容器。"

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