This is one of my favorite epics, both because the T2 & T3 versions have separate encounters to increase replayability (and lots of options for each section within each tier), and because it has one of the best resource systems for allowing players to decide what benefits to get during the epic. One of my biggest complaints about epics is that they tend to hamstring short rest based players (particularly warlocks), but this epic gives players the opportunity to earn rewards that they can spent for buffs, like short & long rests. I had a blast with both tiers' encounters, with the T3 combats being especially challenging and satisfying.

As epics go (and given the track record of DRW modules trending towards feeling bloated) When the Lights Went Out in Candlekeep is a snappy and engaging module from start to finish.

With heaps of great opportunities for players to engage in all pillars of play I would highly recommend this module to any organiser looking to run their own epic event.

Both the T2 and T3 tracks present significant challenge, the final T3 combat is something to behold and really feels like what you would expect as the conclusion to an 'Epic' adventure.

Played through in Tier 2 and 3 at a con and single table, have run it twice at tier 3 single table.

Tier 2 is awesome, through and through. I love that it's an entirely different adventure than the Tier 3 play though, not just a watered down version. It also made prep waaaaaay easier than so many other epics where you have to prepare for 20 different scenarios when your table will only see 3.

Tier 3, if folks take the combat encounter to start, it's extremely hard to pull it off on the clock. Make sure you warn folks that this is going to have to be high-speed, preplan turns, and go-go-go! It is a very challenging combat as well. The final encounter is a great challenge too, and your table's previous decisions can really make it hard. There are tools at their disposal though to take the edge off.

Running as part of the DRW campaign, I slip it in between DRW-13 and DRW-14, so the table has a choice between tier 2 and 3. And since that's 5 adventures in to tier 2, most folks are excited to play it tier 3. But I highly recommend going through it again on a different character in tier 2.