Crucible game modes that take advantage of raid mechanics. An example would be capture the relic. Whichever team has possession of the relic, oracles spawn that try to kill them. They have to survive the same way they would in the vault of glass with the twist of having Guadians trying to kill them. The relic holder would have the same damage as normal but it would be mainly his job to survive and take out oracles. He would get a special sight that let's him see where they are because they'll be spawning in random places around the map. Think of an extreme version of oddball, destiny style.