Wernher said
The same which is used to achieve FTL, flying car or sustainable fusion reaction?That's the thing with science, if you can prove something is doable and this breaks the laws of physics, you have to rework on your understanding of the laws of physics. What this means is that I'm not qualified to say how to make stars blow up, I don't even know if someone on earth is. I'm saying that it might be possible in the future and even if it is not, it's just a damn roleplay, so space magic.
That's fine and all, but I'm just going to say that being an ancient race does not encompass possessing weapons that can destroy entire solar systems. If there was a logical reason behind such technology, I'd concede, but at the moment it looks like senseless wanksauce buffoonery that was engineered to act as a power creep or something.
If anything, why would a peace-loving species even have access to such destructive technology?
This is also a classic example of why ancient species seriously need to be axed from all NRPs. They ultimately turn into the author's personal way of compensating for something that they lack or whatever.