I was planning to run Troubles in Otari after the Beginner Box, but it felt like it was just going to be filler content before moving on to Abomination Vaults so I ended up deciding against that. I'll likely run the Beginner Box/Troubles in Otari for another group of friends later.You can run these in sequence:
Beg Box
Troubles in Otari
Abomination Vaults
Or as standalones starting each with it's own cast of level 1s.
If run in sequence you would need to adjust difficulties as the players will be above level for the second two. But story wise they work in sequence.
Troubles in Otari is a 68 page PDF module.I was planning to run Troubles in Otari after the Beginner Box, but it felt like it was just going to be filler content before moving on to Abomination Vaults so I ended up deciding against that. I'll likely run the Beginner Box/Troubles in Otari for another group of friends later.
While looking over the beginning of Abomination Vaults, I went with this for how to modify the adventure since the group is level 2 going into it:
I moved the graveyard scene that you're supposed to run before moving on to the 2nd level to the beginning, using it as a transition between the Beginner Box and AV to get the group interested in the lighthouse. Once they reached Gauntlight, I had the mitflits in the first level all avoid fighting the group and just hinted at their presence to both establish they're a threat and make the place seem even more eerie. The mitflits all retreated back to the room where Boss Skrawng is located, so when the group opened that door at the end of the session they're in for a much tougher fight to start next week's session.
Worth mentioning I'm running a table of 6 players, so I'll have to adjust the entire thing to account for the larger group. The game's tight math makes it really easy to make those adjustments.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.