Its quite simple really.  It be like PUBG and fortnite expect that several other Tennos are droped into a random area in an open world map, say like the orb vallis for instance. Before dropping in, players can pick a frame of their choice, but the rules of conclave are applied here.  Everyone will have to look for weapons and items (and maybe mods and/or upgrades?) scattered throughout the map and have to fight to survive to become the last Tenno standing.  As to limit the play area as time goes