User blog comment:LivesByProxy/A Void 'Brood-Mother' / 'Hive-Queen' Champion/@comment-24420226-20151031034557

The problem mechanically and balance-wise with having a LoL champion built around controling multple pet units is evident in Heimerdinger's kit: it naturally promotes low-interaction gameplay. You just poop out your units constantly to harass and zone the enemy with little to no risk to yourself. If they try to focus your units, you just poop out more. If they go aggressive directly onto you, your units shred them apart. There's no good option for the enemy in that scenario (it's why Heimer is constantly overnerfed). Zyra partly had this problem on release (and somewhat still does, if you ever played against in her One for All).

If you were serious about a broodling champion, mechanically I would try and solve the issue of low-risk low-punishability. Health costs is one way you could do this; if the broodlings cost health, constantly spawning them can be risky since you can eventually drain your hp so low you become much easier to burst. Another option is using some kind of ammo-style resource that can be built up over time to 'swarm' at the right moment, but takes a while to replinish.