The first step gives you a "big xp boost", not sure how much it is since I'm maxed out on the mastery for old world (out of mastery points to buy the next rank), so it's just basically worthless. Then I go to new map and gotta change to the new mastery and start over.
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While catching up on internet stuff, I'm just doing the first quest on alts, making sure to hop over to HoT before accepting the reward...