It’s a fun little DLC, despite my complaint about lack of information on how specifically things work. It still gets a thumbs up from me.
You select whether you want to play Crucible from the main menu (instead of the campaign). Characters can freely do both, they’re not locked into one mode or the other.
Once you enter the game, you’ll be on one of a handful pre-designed arenas. There’s plenty of room to maneuver (with cover to boot), but it’s definitely an arena, not an open map. Scattered around the arena are nodes where you can build defenses via a Tribute resource you earn by defeating waves of enemies. These defenses can be further upgraded as you go, just taking more Tributes and Iron.
You can also spend Tributes on other things, such as powerful 20-minute buffs for your arena run. If you hit Wave 50 and 100, you can spend Tributes at the start of a Crucible map to restart at those checkpoints, instead of Wave 1.
One of the fantastic things you can spend Tribute points on is Devotion points, like you get from Shrines. I think there’s a cap on how many Devotion points you earn in this way, and the Tribute cost scales based on how many points you’ve already earned. Needless to say, it’s a great way of picking up a quick constellation with a new character. Crucible is also an extremely fast way of leveling up to L20 or so (and still fast thereafter). It’s how I tend to start new characters now. I go to the main game, get one quick level so I have a skill to use, then blast the Crucible to jumpstart a new character.
Anyway, back to the Crucible and how it works. Once you begin, waves of enemies start coming out and attacking you. You have a timer counting down, and if you are able to defeat that wave in the allotted time, you get a Score Multiplier (up to 10x). Killing bosses seems to give you a boost to your time.
At the completion of every 10 waves, you’re given the opportunity to either continue for another 10 or to “cash out” and claim your rewards (EDIT: Wanted to clarify that monsters don’t drop any loot themselves, although there’s a Vital Essence to restore all your constitution/health/energy at the end of each wave. All rewards come form the chests at the end). If you claim your rewards, you get a massive spike of XP and a door opens to a treasure room. This room is filled with chests, the quantity and quality of which is based on either the score or the wave you reached. This is a fantastic way of getting gear for your characters as well as Blueprints you might be missing.
It really is a lot of fun. It’s not a replacement game mode, I’d never just play that, but I love it as a side dish to the main campaign. And like I said, it’s a huge boon for someone with such bad alt-itis as me, as I’m able to very quickly get a solidly geared L20 character whipped up.