In order for Warframes to enter the Rift plane, there must be a Limbo in the Cell. The Limbo can either Banish players, or create a Cataclysm which temporarily warps a zone of the material plane into the Rift. Additionally, Limbo can enter and leave the Rift at will (with his Companion in tow, if any) by Rift Walking (default Shift ), briefly leaving a small portal in his wake that allies can touch to enter the Rift temporarily.