How to get Avada Kedavra?

Avada Kedavra can be unlocked after you have completed quests from Sebastian Sallow, one of the students from Slytherin that you can be friends with in the game.

Work your way through Sebastian's quests in order unlock the three unforgivable curses; Crucio, Imperio, and Avada Kedavra.

Specifically, Avada Kedavra is unlocked after you complete, 'In the Shadow of the Relic' from Sebastian's storyline.

To be sure that you get it though, you must answer correctly the question:

Everyone should know about that curse

The answer you need to give is 'Yes, Please.'

Avada Kedavra is an incredibly powerful spell, and gives the strongest attack in the game. Use it to one hit kill any of the bosses that you are having trouble with. Be wary though of the long cooldown time, so you have to choose your moments with this curse.

You are not penalised in the game in any way for using Avada Kedavra, so once you have unlocked it you can use it in the game without any dire consequences... For you aanyway! Can't say the same for your enemies that you use it on.

One other thing to note about Avada Kedavra is that it cannot be used on other students and also it won't work undead such as the Inferius because they're already dead.

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