I wish we could have a practice mode in raids, or even dungeons, with no loot, so we could learn the mechanics without worrying about ads.
So all the mechanics would be there, even a wipe mechanic, but ads and enemies would have like 1 hp. Thank you.
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Doing that won't help you clear the real mode. Go and try the raid. Fail until you get a rhythm going. Its what everyone else experiences.