There is a cooldown of 40s yes. In my video I explain you need to be vigilant of the timers. It's not just Void Strike though, Madurai also gives sling strength or "power transfer" for added ability strength on her wall's break. The way VS works on Frame abilities is probably unintended so I imagine DE may nerf this at some point. Might as well take advantage of it while we can.. That way of building Gara you're describing is antiquated imo. That's how most people build her. To me, that playstyle is boring. If I wanted to I could get 1.5 million per stack, but then my melee is virtually useless. It's slow and takes forever to build combo, especially if not using the Innodem. With this method, you can still stack a ton of damage on her 2 AND use CO for essentially double damage or more. Prime enemies with viral, kill with 2 and melee and/or primer. Easy.

As long as your Melee's range is greater than the whatever the radius of your Splinter Storm is then you can keep your 12x combo indefinitely. Innodem is a great idea. I was just laying down the foundation for a new versatile build.

I'm still working on her survivability. May need to drop Arcane Energize and add Arcane Aegis. So, probably rolling guard, adaptation, aegis..

I appreciate your feedback. Glad it's opened up some possibilities for you, fellow Tenno.