The main problem with this is the need to rely on other frames to unlock its actual potential. This should never be a thing. First of all, it really discourages solo play, which is favourable for many people. Secondly, with the details you provided, you could only use this frame to its full potential if the team consisted of Ivara, Banshee, and Nekros; why would this be a thing? Not only are you massively limiting yourself, you’re also limiting other people with what they can play just to maximise this frame’s potential (which is not even that strong to begin with). Now let’s discuss the abilities:
The passive is the worst part, you mentioned increased damage on a single shot when invisible; okay, but there’s no way this frame can turn itself invisible, so this is just pointless. There isn’t really an issue with the first ability, very simple but plausible (other than the need for Banshee to make it good).
The second ability confuses me, you’ve essentially made a worse version of Nekros’ desecrate which is buffed by Nekros. But why would you use this worse version if you already have a Nekros on the team?? Utterly pointless.
The third ability has some potential, the idea of crowd control void vines is very interesting, but the siphoning of ammo is a little useless, it’s very rare that you run low enough to warrant using this ability for ammo replen. Also, again with relying on another frame for full potential, this is bad design.
The fourth ability is the best of a bad bunch, it does have some potential. But I feel as though you got confused in the statistics. You mentioned that the weapon has high crit-damage but low crit-chance. Why? This is VERY poor design for an exalted weapon. An exalted weapon should be powerful given that it is an ultimate ability, whereas this weapon’s power is completely diminished by the low crit chance, it wouldn’t be able to utilise its strength as the frequency of its availability is too low.
Edit: The purpose of this reply isn’t to belittle your concept, just to highlight the issues so you can change it, and it’ll have a higher chance of being selected. Hope I wasn’t too harsh.