Destiny 2 Dungeons Boost & Carry

Some can, depending on your gear and class, while others are tuned for a fireteam of two or three. A solo offer in the listing is run by a player who has the skill and build for it.

Yes, farm offers exist for a number of dungeons. Drops are random, so the offer describes the chase and not a fixed outcome.

Up to three Guardians, which is why the boost team fills the other seats around you.

Yes, the listing includes an All Dungeons bundle for those who need several dungeons at once.