What kind of game mode is Egg Heist?

Extraction is the part that matters. Finding a special egg does not mean you own it. You own it when you leave the map with it, and everything between those two moments is other squads who would rather you did not. Beat a rival team and their items become yours. The reverse is just as true, so a good run can be undone in the last thirty seconds by a team that did nothing but wait near an exit.

You go in as a group of three. That size shapes the mode more than anything else, because the PvE side and the PvP side both have to be handled by the same three people, and splitting up to cover more ground is also how you get picked off one at a time.

The mode turns up under more than one name. Diamond Egg Theft is the same thing, and you will also see it written as Operation Egg Heist. The English naming is not settled yet.

Carrying the central giant egg

The big prize changes how your squad plays. Whoever picks up the central giant egg transforms into it and loses their combat abilities entirely. They cannot fight back, they cannot defend themselves, and they have to be walked all the way to evacuation.

That leaves your other two players as the entire defence. One carrier, two escorts, and no way to swap roles out of trouble mid-fight. Deciding who takes it, and what route you take out, is the real decision in a round.

Chaos mode

There is a harder version. Chaos mode is the hardcore difficulty setting for Egg Heist, sitting above the standard run for players who want the mode to push back properly.

Not settled: What Chaos mode changes beyond raising the difficulty is not detailed yet, so there is no way to say whether it alters the extraction rules or the giant egg carrier's handicap or simply makes everything tougher.