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Fast guide on how to obtain Slime Serpent: Secret Mount in World of Warcraft Shadowlands Dungeon Plaguefall.
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Not sure about the fact of killing all bosses. When we find out you can get this mount back in SL only requirement was to kill last boss. back then you could skip first and second boss. Right now I think youre obligated to kill first boss to unlock next area but you can comfortably skip second one. Cheers! 🍻
PS: also it's not "you should be alone" you need to be alone:)