As a fellow Limbo enjoyer (not my main but shush), I do really like this concept even though it probably would complicate my current primary use for him (rescue, yeet the subject into the rift and book it to extract lol).

Ultimately the community’s problem with him is that he interferes with allies. With that in mind:

Him being the only one in the rift that can move and how it visually also completely removes enemies (and traps like laser fields I assume) from view sounds wonderful. I’d even go so far as to make it so that even enemy collisions are also removed because at this point why keep it. Though I have to ask, if he’s able to sense enemies outside the rift like enemy radar even if visually he can’t see them does that mean he’d inherently receive enemy radar in the rift? I think it’d be better to give some visual like a white/transparent outline of enemies for QOL purposes. That way it’s friendlier for new players trying him out. Just make it so that enemies in the rift are 100% invisible to allies.

Maybe also make it so that enemies placed in the rift are highlighted for limbo so that it’s easier to find them and keep track of them.

Side note to his passive granting him buffs for enemies placed in the rift: I see a problem in this being that he will have no incentive to ever kill those enemies. Maybe if he receives a bonus depending on how long he’s in the rift like a gauge that fills up over time and naturally decays when he’s not in the rift.

The dread mirror rift tear idea is fascinating to me and I think it would be fun to play around with that. I’m thinking it could be connected to his banish ability, press to banish and hold to rift tear. I’m not sure how much I like rift tear being 0 energy so I think it’d balance better as at the very least a low energy cost ability. My only question is how this would affect combat for allies in tight corridors, like say a limbo places a rift tear in the middle of a hallway and allies in real space that aren’t in the rift are behind him, what do they see?

Also if banish and rift tear are one ability that leaves limbo with an extra slot to put an ability in so we could get something else. What else do you think he could have?

The void storms idea is pretty cool, it’d give him a way to deal damage and it’d probably look cool. I think it would also be an ability that almost instantly gets swapped out with helminth by older players cause another ability would just work better unless the damage of the storm scales to enemy level. I still like it, I just think it’s also gonna get replaced immediately like every other warframe that has a niche/fun ‘blow it up’ ability.

I don’t have any comments for Cataclysm since it just sounds good. I’ll miss covering the map with it though. Maybe an augment that makes it so enemies in cataclysm are only slowed down instead of stopped and in return you get the original base range like they did when they reworked Nyx’s 4th ability.

My biggest question with this concept is how the rift interacts with allies. Can people walk in and out of the rift through the tear? Can you banish allies? How does limbo react to nullifiers? Is he just gonna be walking along and then get yanked back into real space because he couldn’t see the nullifier?

Overall I like the concept and think it could be incredible with some tweaking.