Limbo is the curator of the rift, a dimension of his making that exists parallel to our own. With his ability to step between planes of reality and control the laws of the rift, Limbo has almost unparalleled levels of enemy control. Limbo is an extremely complicated warframe. His abilities require foresight, planning, and an awareness of which plane of reality you or your enemies are on. I won't be explaining the mechanics of the rift here as it requires some playing on the player's part to understand. However, at a basic level: if an enemy is in the rift dimension they cannot be damaged by someone in reality, and vice versa. Limbo can freeze time for all enemies within the rift, completing disabling them and freezing them in time. This is where his enemy control comes from and it is most important ability. If this sounds fun to you, I highly recommend pursuing Limbo and putting some time in to figuring him out. If this sounds like too much of a headache, no worries, as Limbo's role is easily filled by more straightforward and outwardly powerful warframes.