I would really like it if there were dungeons/gates were having a party to advance was obligatory (or really helpful) due to the mechanics.
To access these there would be a queue, or a similar system to create a party.

If this is not possible, these could anyways be implemented as alternative paths to normal progression in a dungeon, after a sign that tells you you need X party members to go that way. If implemented as alternative paths, there would be strong enemies and good loot in those paths.

Obligatory party:
- X switches, which should have a knight standing on each to activate. These might be found after a section that splits the knights, so they have to solo for a bit to get to their switch.
- Split path, where one knight on each path opens the gates of others in the other paths (as in Sakons Hideout from Majora's Mask)
- A giant pot/statue/etc that requires 4 knights to lift it at the same time (and has something interesting behind it).

Encouraged party:
- A dungeon that is completely pitch black (as in those screens from faulty video drivers) and requires one knight to carry around a lamp so the others can see. It can be left on the ground if needed, like golden keys.
- Reverse zombie totems, as in, you need someone to carry a totem that stops zombies from reviving

The only downside is what to do if a party member leaves. There should be workarounds to this. The most simple being having an elevator or a way to go back in each area.

Discuss. And give ideas. And copy Zelda 4 Swords.